251112155553 has 96 divisors (see below), whose sum is σ = 427218105600. Its totient is φ = 139154416128.

The previous prime is 251112155527. The next prime is 251112155603. The reversal of 251112155553 is 355551211152.

251112155553 is a `hidden beast` number, since 2 + 51 + 1 + 1 + 2 + 1 + 55 + 553 = 666.

It is not a de Polignac number, because 251112155553 - 2¹⁰ = 251112154529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251112155053) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 370918651 + ... + 370919327.

It is an arithmetic number, because the mean of its divisors is an integer number (4450188600).

Almost surely, 2^251112155553 is an apocalyptic number.

It is an amenable number.

251112155553 is a deficient number, since it is larger than the sum of its proper divisors (176105950047).

251112155553 is a wasteful number, since it uses less digits than its factorization.

251112155553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1508 counting only the distinct ones).

The product of its digits is 37500, while the sum is 36.

The spelling of 251112155553 in words is "two hundred fifty-one billion, one hundred twelve million, one hundred fifty-five thousand, five hundred fifty-three".