56169069891 has 16 divisors (see below), whose sum is σ = 84517724160. Its totient is φ = 32868002720.

The previous prime is 56169069857. The next prime is 56169069917. The reversal of 56169069891 is 19896096165.

It is a cyclic number.

It is not a de Polignac number, because 56169069891 - 2²⁵ = 56135515459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56169069821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29345475 + ... + 29347388.

It is an arithmetic number, because the mean of its divisors is an integer number (5282357760).

Almost surely, 2^56169069891 is an apocalyptic number.

56169069891 is a deficient number, since it is larger than the sum of its proper divisors (28348654269).

56169069891 is a wasteful number, since it uses less digits than its factorization.

56169069891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58692906.

The product of its (nonzero) digits is 6298560, while the sum is 60.

The spelling of 56169069891 in words is "fifty-six billion, one hundred sixty-nine million, sixty-nine thousand, eight hundred ninety-one".