251943962961 has 16 divisors (see below), whose sum is σ = 341455699008. Its totient is φ = 165197812800.

The previous prime is 251943962953. The next prime is 251943962993. The reversal of 251943962961 is 169269349152.

It is not a de Polignac number, because 251943962961 - 2³ = 251943962953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251943962161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3253351 + ... + 3329891.

It is an arithmetic number, because the mean of its divisors is an integer number (21340981188).

Almost surely, 2^251943962961 is an apocalyptic number.

It is an amenable number.

251943962961 is a deficient number, since it is larger than the sum of its proper divisors (89511736047).

251943962961 is a wasteful number, since it uses less digits than its factorization.

251943962961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94592.

The product of its digits is 6298560, while the sum is 57.

The spelling of 251943962961 in words is "two hundred fifty-one billion, nine hundred forty-three million, nine hundred sixty-two thousand, nine hundred sixty-one".