63957988566 has 12 divisors (see below), whose sum is σ = 138575641932. Its totient is φ = 21319329516.

The previous prime is 63957988559. The next prime is 63957988571. The reversal of 63957988566 is 66588975936.

63957988566 is a `hidden beast` number, since 6 + 3 + 9 + 57 + 9 + 8 + 8 + 566 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 63957988494 and 63957988503.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1776610776 + ... + 1776610811.

It is an arithmetic number, because the mean of its divisors is an integer number (11547970161).

Almost surely, 2^63957988566 is an apocalyptic number.

63957988566 is an abundant number, since it is smaller than the sum of its proper divisors (74617653366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63957988566 is a wasteful number, since it uses less digits than its factorization.

63957988566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553221595 (or 3553221592 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 72.

The spelling of 63957988566 in words is "sixty-three billion, nine hundred fifty-seven million, nine hundred eighty-eight thousand, five hundred sixty-six".