56111660905 has 4 divisors (see below), whose sum is σ = 67333993092. Its totient is φ = 44889328720.

The previous prime is 56111660851. The next prime is 56111660933. The reversal of 56111660905 is 50906611165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6119619984 + 49992040921 = 78228^2 + 223589^2 .

It is not a de Polignac number, because 56111660905 - 2⁷ = 56111660777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5611166086 + ... + 5611166095.

It is an arithmetic number, because the mean of its divisors is an integer number (16833498273).

Almost surely, 2^56111660905 is an apocalyptic number.

It is an amenable number.

56111660905 is a deficient number, since it is larger than the sum of its proper divisors (11222332187).

56111660905 is a wasteful number, since it uses less digits than its factorization.

56111660905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11222332186.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 56111660905 in words is "fifty-six billion, one hundred eleven million, six hundred sixty thousand, nine hundred five".