56664721776 has 160 divisors (see below), whose sum is σ = 167797260288. Its totient is φ = 16323194880.

The previous prime is 56664721739. The next prime is 56664721831. The reversal of 56664721776 is 67712746665.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2012145 + ... + 2040111.

Almost surely, 2^56664721776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56664721776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83898630144).

56664721776 is an abundant number, since it is smaller than the sum of its proper divisors (111132538512).

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

56664721776 is a wasteful number, since it uses less digits than its factorization.

56664721776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28199 (or 28193 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 57.

The spelling of 56664721776 in words is "fifty-six billion, six hundred sixty-four million, seven hundred twenty-one thousand, seven hundred seventy-six".