631915422561 has 24 divisors (see below), whose sum is σ = 913607635200. Its totient is φ = 420889019616.

The previous prime is 631915422533. The next prime is 631915422563. The reversal of 631915422561 is 165224519136.

It is a happy number.

631915422561 is a `hidden beast` number, since 6 + 3 + 19 + 1 + 54 + 22 + 561 = 666.

It is not a de Polignac number, because 631915422561 - 2¹⁵ = 631915389793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631915422563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67994431 + ... + 68003723.

It is an arithmetic number, because the mean of its divisors is an integer number (38066984800).

Almost surely, 2^631915422561 is an apocalyptic number.

It is an amenable number.

631915422561 is a deficient number, since it is larger than the sum of its proper divisors (281692212639).

631915422561 is a wasteful number, since it uses less digits than its factorization.

631915422561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15445 (or 15442 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 631915422561 in words is "six hundred thirty-one billion, nine hundred fifteen million, four hundred twenty-two thousand, five hundred sixty-one".