685256524965 has 128 divisors (see below), whose sum is σ = 1310292910080. Its totient is φ = 338948983296.

The previous prime is 685256524957. The next prime is 685256524987. The reversal of 685256524965 is 569425652586.

685256524965 is a `hidden beast` number, since 6 + 8 + 5 + 2 + 565 + 2 + 4 + 9 + 65 = 666.

685256524965 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685256524965 - 2³ = 685256524957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18272824 + ... + 18310286.

It is an arithmetic number, because the mean of its divisors is an integer number (10236663360).

Almost surely, 2^685256524965 is an apocalyptic number.

It is an amenable number.

685256524965 is a deficient number, since it is larger than the sum of its proper divisors (625036385115).

685256524965 is a wasteful number, since it uses less digits than its factorization.

685256524965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37680 (or 37674 counting only the distinct ones).

The product of its digits is 155520000, while the sum is 63.

The spelling of 685256524965 in words is "six hundred eighty-five billion, two hundred fifty-six million, five hundred twenty-four thousand, nine hundred sixty-five".