56911688681 has 8 divisors (see below), whose sum is σ = 62879410944. Its totient is φ = 51235074880.

The previous prime is 56911688641. The next prime is 56911688689. The reversal of 56911688681 is 18688611965.

It is a happy number.

56911688681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56911688681 - 2²⁶ = 56844579817 is a prime.

It is a super-2 number, since 2×56911688681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56911688681.

It is not an unprimeable number, because it can be changed into a prime (56911688689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72776705 + ... + 72777486.

It is an arithmetic number, because the mean of its divisors is an integer number (7859926368).

Almost surely, 2^56911688681 is an apocalyptic number.

It is an amenable number.

56911688681 is a deficient number, since it is larger than the sum of its proper divisors (5967722263).

56911688681 is a wasteful number, since it uses less digits than its factorization.

56911688681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145554231.

The product of its digits is 4976640, while the sum is 59.

The spelling of 56911688681 in words is "fifty-six billion, nine hundred eleven million, six hundred eighty-eight thousand, six hundred eighty-one".