64661925231 has 12 divisors (see below), whose sum is σ = 93874675752. Its totient is φ = 42889126896.

The previous prime is 64661925191. The next prime is 64661925233. The reversal of 64661925231 is 13252916646.

64661925231 is a `hidden beast` number, since 6 + 4 + 6 + 619 + 2 + 5 + 23 + 1 = 666.

It is not a de Polignac number, because 64661925231 - 2¹⁷ = 64661794159 is a prime.

It is a super-2 number, since 2×64661925231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661925233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18233401 + ... + 18236946.

It is an arithmetic number, because the mean of its divisors is an integer number (7822889646).

Almost surely, 2^64661925231 is an apocalyptic number.

64661925231 is a deficient number, since it is larger than the sum of its proper divisors (29212750521).

64661925231 is a wasteful number, since it uses less digits than its factorization.

64661925231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36470550 (or 36470547 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 64661925231 in words is "sixty-four billion, six hundred sixty-one million, nine hundred twenty-five thousand, two hundred thirty-one".