56511005091 has 4 divisors (see below), whose sum is σ = 75348006792. Its totient is φ = 37674003392.

The previous prime is 56511005069. The next prime is 56511005099. The reversal of 56511005091 is 19050011565.

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 56511005091 - 2²⁹ = 55974134179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56511005099) 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, 9418500846 + ... + 9418500851.

It is an arithmetic number, because the mean of its divisors is an integer number (18837001698).

Almost surely, 2^56511005091 is an apocalyptic number.

56511005091 is a deficient number, since it is larger than the sum of its proper divisors (18837001701).

56511005091 is a wasteful number, since it uses less digits than its factorization.

56511005091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18837001700.

The product of its (nonzero) digits is 6750, while the sum is 33.

The spelling of 56511005091 in words is "fifty-six billion, five hundred eleven million, five thousand, ninety-one".