56661488416664 has 64 divisors (see below), whose sum is σ = 112554844768800. Its totient is φ = 26648797593600.

The previous prime is 56661488416661. The next prime is 56661488416679. The reversal of 56661488416664 is 46661488416665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661488416661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1884994067 + ... + 1885024125.

Almost surely, 2^{56661488416664} is an apocalyptic number.

It is an amenable number.

56661488416664 is a deficient number, since it is larger than the sum of its proper divisors (55893356352136).

56661488416664 is a wasteful number, since it uses less digits than its factorization.

56661488416664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37644 (or 37640 counting only the distinct ones).

The product of its digits is 955514880, while the sum is 71.

Subtracting from 56661488416664 its reverse (46661488416665), we obtain a palindrome (9999999999999).

The spelling of 56661488416664 in words is "fifty-six trillion, six hundred sixty-one billion, four hundred eighty-eight million, four hundred sixteen thousand, six hundred sixty-four".