251311663452 has 48 divisors (see below), whose sum is σ = 590767494912. Its totient is φ = 83146675200.

The previous prime is 251311663433. The next prime is 251311663501. The reversal of 251311663452 is 254366113152.

It is a happy number.

It is a super-2 number, since 2×251311663452² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251311663452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2148223 + ... + 2262185.

It is an arithmetic number, because the mean of its divisors is an integer number (12307656144).

Almost surely, 2^251311663452 is an apocalyptic number.

It is an amenable number.

251311663452 is an abundant number, since it is smaller than the sum of its proper divisors (339455831460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251311663452 is a wasteful number, since it uses less digits than its factorization.

251311663452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115338 (or 115336 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The spelling of 251311663452 in words is "two hundred fifty-one billion, three hundred eleven million, six hundred sixty-three thousand, four hundred fifty-two".