251414233640 has 16 divisors (see below), whose sum is σ = 565682025780. Its totient is φ = 100565693440.

The previous prime is 251414233621. The next prime is 251414233661. The reversal of 251414233640 is 46332414152.

It can be written as a sum of positive squares in 2 ways, for example, as 241204747876 + 10209485764 = 491126^2 + 101042^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 251414233640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3142677881 + ... + 3142677960.

Almost surely, 2^251414233640 is an apocalyptic number.

251414233640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251414233640 is an abundant number, since it is smaller than the sum of its proper divisors (314267792140).

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

251414233640 is a wasteful number, since it uses less digits than its factorization.

251414233640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6285355852 (or 6285355848 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 251414233640 its reverse (46332414152), we get a palindrome (297746647792).

The spelling of 251414233640 in words is "two hundred fifty-one billion, four hundred fourteen million, two hundred thirty-three thousand, six hundred forty".