251640101275 has 24 divisors (see below), whose sum is σ = 316634158224. Its totient is φ = 198349747200.

The previous prime is 251640101261. The next prime is 251640101393. The reversal of 251640101275 is 572101046152.

It is not a de Polignac number, because 251640101275 - 2⁵ = 251640101243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251640101275.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1712460 + ... + 1853590.

It is an arithmetic number, because the mean of its divisors is an integer number (13193089926).

Almost surely, 2^251640101275 is an apocalyptic number.

251640101275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

251640101275 is a deficient number, since it is larger than the sum of its proper divisors (64994056949).

251640101275 is a wasteful number, since it uses less digits than its factorization.

251640101275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142191 (or 142186 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 251640101275 in words is "two hundred fifty-one billion, six hundred forty million, one hundred one thousand, two hundred seventy-five".