256602510465 has 32 divisors (see below), whose sum is σ = 469639330560. Its totient is φ = 117198177024.

The previous prime is 256602510443. The next prime is 256602510469. The reversal of 256602510465 is 564015206652.

It is a happy number.

It is not a de Polignac number, because 256602510465 - 2⁷ = 256602510337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256602510469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 985374 + ... + 1218263.

It is an arithmetic number, because the mean of its divisors is an integer number (14676229080).

Almost surely, 2^256602510465 is an apocalyptic number.

It is an amenable number.

256602510465 is a deficient number, since it is larger than the sum of its proper divisors (213036820095).

256602510465 is a wasteful number, since it uses less digits than its factorization.

256602510465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204761.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 256602510465 in words is "two hundred fifty-six billion, six hundred two million, five hundred ten thousand, four hundred sixty-five".