56691819689 has 2 divisors, whose sum is σ = 56691819690. Its totient is φ = 56691819688.

The previous prime is 56691819683. The next prime is 56691819707. The reversal of 56691819689 is 98691819665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56093185600 + 598634089 = 236840^2 + 24467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56691819689 is a prime.

It is not a weakly prime, because it can be changed into another prime (56691819683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28345909844 + 28345909845.

It is an arithmetic number, because the mean of its divisors is an integer number (28345909845).

Almost surely, 2^56691819689 is an apocalyptic number.

It is an amenable number.

56691819689 is a deficient number, since it is larger than the sum of its proper divisors (1).

56691819689 is an equidigital number, since it uses as much as digits as its factorization.

56691819689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 68.

The spelling of 56691819689 in words is "fifty-six billion, six hundred ninety-one million, eight hundred nineteen thousand, six hundred eighty-nine".