56791605991 has 4 divisors (see below), whose sum is σ = 56799486712. Its totient is φ = 56783725272.

The previous prime is 56791605979. The next prime is 56791606009. The reversal of 56791605991 is 19950619765.

56791605991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 56791605991 - 2¹¹ = 56791603943 is a prime.

It is a super-2 number, since 2×56791605991² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56791605691) 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, 3929541 + ... + 3943966.

It is an arithmetic number, because the mean of its divisors is an integer number (14199871678).

Almost surely, 2^56791605991 is an apocalyptic number.

56791605991 is a deficient number, since it is larger than the sum of its proper divisors (7880721).

56791605991 is an equidigital number, since it uses as much as digits as its factorization.

56791605991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7880720.

The product of its (nonzero) digits is 4592700, while the sum is 58.

The spelling of 56791605991 in words is "fifty-six billion, seven hundred ninety-one million, six hundred five thousand, nine hundred ninety-one".