137,438,953,471

Number
$137 \, 438 \, 953 \, 471$ is:
 * $223 \times 616 \, 318 \, 177$


 * The $4$th Mersenne number after $2047$, $8 \, 388 \, 607$, $536 \, 870 \, 911$ which is composite:
 * $137 \, 438 \, 953 \, 471 = 2^{37} - 1 = 47 \times 178 \, 481$


 * The $12$th Mersenne number after $3$, $7$, $31$, $127$, $2047$, $8191$, $131 \, 071$, $524 \, 287$, $8 \, 388 \, 607$, $536 \, 870 \, 911$, $2 \, 147 \, 483 \, 647$:
 * $137 \, 438 \, 953 \, 471 = 2^{37} - 1$