64131630561 has 12 divisors (see below), whose sum is σ = 92784237520. Its totient is φ = 42685346520.

The previous prime is 64131630553. The next prime is 64131630617. The reversal of 64131630561 is 16503613146.

64131630561 is a `hidden beast` number, since 6 + 4 + 1 + 31 + 63 + 0 + 561 = 666.

It is not a de Polignac number, because 64131630561 - 2³ = 64131630553 is a prime.

It is a super-2 number, since 2×64131630561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64131630061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5750275 + ... + 5761416.

Almost surely, 2^64131630561 is an apocalyptic number.

It is an amenable number.

64131630561 is a deficient number, since it is larger than the sum of its proper divisors (28652606959).

64131630561 is a wasteful number, since it uses less digits than its factorization.

64131630561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11512316 (or 11512313 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 64131630561 in words is "sixty-four billion, one hundred thirty-one million, six hundred thirty thousand, five hundred sixty-one".