251563326040 has 64 divisors (see below), whose sum is σ = 609613351200. Its totient is φ = 92876378112.

The previous prime is 251563325929. The next prime is 251563326097. The reversal of 251563326040 is 40623365152.

It is a super-3 number, since 3×251563326040³ (a number of 35 digits) contains 333 as substring.

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, 9821971 + ... + 9847549.

Almost surely, 2^251563326040 is an apocalyptic number.

251563326040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251563326040 is an abundant number, since it is smaller than the sum of its proper divisors (358050025160).

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

251563326040 is a wasteful number, since it uses less digits than its factorization.

251563326040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44516 (or 44512 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 251563326040 in words is "two hundred fifty-one billion, five hundred sixty-three million, three hundred twenty-six thousand, forty".