56686969769 has 2 divisors, whose sum is σ = 56686969770. Its totient is φ = 56686969768.

The previous prime is 56686969721. The next prime is 56686969771. The reversal of 56686969769 is 96796968665.

56686969769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49111878544 + 7575091225 = 221612^2 + 87035^2 .

It is a cyclic number.

It is not a de Polignac number, because 56686969769 - 2⁸ = 56686969513 is a prime.

It is a super-2 number, since 2×56686969769² (a number of 22 digits) contains 22 as substring.

Together with 56686969771, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56686969769.

It is not a weakly prime, because it can be changed into another prime (56686999769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28343484884 + 28343484885.

It is an arithmetic number, because the mean of its divisors is an integer number (28343484885).

Almost surely, 2^56686969769 is an apocalyptic number.

It is an amenable number.

56686969769 is a deficient number, since it is larger than the sum of its proper divisors (1).

56686969769 is an equidigital number, since it uses as much as digits as its factorization.

56686969769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587237120, while the sum is 77.

The spelling of 56686969769 in words is "fifty-six billion, six hundred eighty-six million, nine hundred sixty-nine thousand, seven hundred sixty-nine".