251943962959 has 4 divisors (see below), whose sum is σ = 271324267816. Its totient is φ = 232563658104.

The previous prime is 251943962953. The next prime is 251943962993. The reversal of 251943962959 is 959269349152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251943962959 - 2¹³ = 251943954767 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 251943962959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251943962953) 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, 9690152409 + ... + 9690152434.

It is an arithmetic number, because the mean of its divisors is an integer number (67831066954).

Almost surely, 2^251943962959 is an apocalyptic number.

251943962959 is a deficient number, since it is larger than the sum of its proper divisors (19380304857).

251943962959 is a wasteful number, since it uses less digits than its factorization.

251943962959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19380304856.

The product of its digits is 47239200, while the sum is 64.

The spelling of 251943962959 in words is "two hundred fifty-one billion, nine hundred forty-three million, nine hundred sixty-two thousand, nine hundred fifty-nine".