56171670091 has 4 divisors (see below), whose sum is σ = 59128073800. Its totient is φ = 53215266384.

The previous prime is 56171670083. The next prime is 56171670097. The reversal of 56171670091 is 19007617165.

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 56171670091 - 2³ = 56171670083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56171670097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478201826 + ... + 1478201863.

It is an arithmetic number, because the mean of its divisors is an integer number (14782018450).

Almost surely, 2^56171670091 is an apocalyptic number.

56171670091 is a deficient number, since it is larger than the sum of its proper divisors (2956403709).

56171670091 is a wasteful number, since it uses less digits than its factorization.

56171670091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956403708.

The product of its (nonzero) digits is 79380, while the sum is 43.

The spelling of 56171670091 in words is "fifty-six billion, one hundred seventy-one million, six hundred seventy thousand, ninety-one".