251285262855 has 32 divisors (see below), whose sum is σ = 438633964800. Its totient is φ = 121827790080.

The previous prime is 251285262841. The next prime is 251285262857. The reversal of 251285262855 is 558262582152.

It is not a de Polignac number, because 251285262855 - 2²¹ = 251283165703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251285262798 and 251285262807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251285262857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3422571 + ... + 3495219.

It is an arithmetic number, because the mean of its divisors is an integer number (13707311400).

Almost surely, 2^251285262855 is an apocalyptic number.

251285262855 is a deficient number, since it is larger than the sum of its proper divisors (187348701945).

251285262855 is a wasteful number, since it uses less digits than its factorization.

251285262855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93631.

The product of its digits is 3840000, while the sum is 51.

The spelling of 251285262855 in words is "two hundred fifty-one billion, two hundred eighty-five million, two hundred sixty-two thousand, eight hundred fifty-five".