56166777839 has 4 divisors (see below), whose sum is σ = 57005088024. Its totient is φ = 55328467656.

The previous prime is 56166777829. The next prime is 56166777871. The reversal of 56166777839 is 93877766165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56166777839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56166777829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419154992 + ... + 419155125.

It is an arithmetic number, because the mean of its divisors is an integer number (14251272006).

Almost surely, 2^56166777839 is an apocalyptic number.

56166777839 is a deficient number, since it is larger than the sum of its proper divisors (838310185).

56166777839 is an equidigital number, since it uses as much as digits as its factorization.

56166777839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838310184.

The product of its digits is 80015040, while the sum is 65.

The spelling of 56166777839 in words is "fifty-six billion, one hundred sixty-six million, seven hundred seventy-seven thousand, eight hundred thirty-nine".