251495121952 has 24 divisors (see below), whose sum is σ = 500235471036. Its totient is φ = 124451192832.

The previous prime is 251495121931. The next prime is 251495121953. The reversal of 251495121952 is 259121594152.

It can be written as a sum of positive squares in 2 ways, for example, as 249636132496 + 1858989456 = 499636^2 + 43116^2 .

It is not an unprimeable number, because it can be changed into a prime (251495121953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40508353 + ... + 40514560.

Almost surely, 2^251495121952 is an apocalyptic number.

It is an amenable number.

251495121952 is a deficient number, since it is larger than the sum of its proper divisors (248740349084).

251495121952 is an equidigital number, since it uses as much as digits as its factorization.

251495121952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81023020 (or 81023012 counting only the distinct ones).

The product of its digits is 324000, while the sum is 46.

The spelling of 251495121952 in words is "two hundred fifty-one billion, four hundred ninety-five million, one hundred twenty-one thousand, nine hundred fifty-two".