251668560052 has 24 divisors (see below), whose sum is σ = 542055360896. Its totient is φ = 99561188448.

The previous prime is 251668560043. The next prime is 251668560079. The reversal of 251668560052 is 250065866152.

It is a junction number, because it is equal to n+sod(n) for n = 251668559984 and 251668560011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345698208 + ... + 345698935.

Almost surely, 2^251668560052 is an apocalyptic number.

It is an amenable number.

251668560052 is an abundant number, since it is smaller than the sum of its proper divisors (290386800844).

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

251668560052 is a wasteful number, since it uses less digits than its factorization.

251668560052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691397167 (or 691397165 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 46.

The spelling of 251668560052 in words is "two hundred fifty-one billion, six hundred sixty-eight million, five hundred sixty thousand, fifty-two".