56660631989 has 8 divisors (see below), whose sum is σ = 61028871960. Its totient is φ = 52293782016.

The previous prime is 56660631961. The next prime is 56660632003. The reversal of 56660631989 is 98913606665.

56660631989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15262625764 + 41398006225 = 123542^2 + 203465^2 .

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 56660631989 - 2²⁰ = 56659583413 is a prime.

It is a super-2 number, since 2×56660631989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56660631949) 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, 262052 + ... + 426605.

It is an arithmetic number, because the mean of its divisors is an integer number (7628608995).

Almost surely, 2^56660631989 is an apocalyptic number.

It is an amenable number.

56660631989 is a deficient number, since it is larger than the sum of its proper divisors (4368239971).

56660631989 is a wasteful number, since it uses less digits than its factorization.

56660631989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694999.

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 56660631989 in words is "fifty-six billion, six hundred sixty million, six hundred thirty-one thousand, nine hundred eighty-nine".