56691819660 has 48 divisors (see below), whose sum is σ = 181413824256. Its totient is φ = 12958130112.

The previous prime is 56691819659. The next prime is 56691819683. The reversal of 56691819660 is 6691819665.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 56691819660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67489842 + ... + 67490681.

It is an arithmetic number, because the mean of its divisors is an integer number (3779454672).

Almost surely, 2^56691819660 is an apocalyptic number.

It is an amenable number.

56691819660 is an abundant number, since it is smaller than the sum of its proper divisors (124722004596).

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

56691819660 is a wasteful number, since it uses less digits than its factorization.

56691819660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134980542 (or 134980540 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 56691819660 in words is "fifty-six billion, six hundred ninety-one million, eight hundred nineteen thousand, six hundred sixty".