251664315265 has 8 divisors (see below), whose sum is σ = 329451467328. Its totient is φ = 183028592880.

The previous prime is 251664315251. The next prime is 251664315277. The reversal of 251664315265 is 562513466152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251664315265 - 2¹⁵ = 251664282497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2287857357 + ... + 2287857466.

It is an arithmetic number, because the mean of its divisors is an integer number (41181433416).

Almost surely, 2^251664315265 is an apocalyptic number.

It is an amenable number.

251664315265 is a deficient number, since it is larger than the sum of its proper divisors (77787152063).

251664315265 is a wasteful number, since it uses less digits than its factorization.

251664315265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4575714839.

The product of its digits is 1296000, while the sum is 46.

The spelling of 251664315265 in words is "two hundred fifty-one billion, six hundred sixty-four million, three hundred fifteen thousand, two hundred sixty-five".