56717172155 has 32 divisors (see below), whose sum is σ = 78716529024. Its totient is φ = 38426628096.

The previous prime is 56717172143. The next prime is 56717172157. The reversal of 56717172155 is 55127171765.

It is a cyclic number.

It is not a de Polignac number, because 56717172155 - 2¹⁰ = 56717171131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56717172157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2067509 + ... + 2094761.

It is an arithmetic number, because the mean of its divisors is an integer number (2459891532).

Almost surely, 2^56717172155 is an apocalyptic number.

56717172155 is a deficient number, since it is larger than the sum of its proper divisors (21999356869).

56717172155 is a wasteful number, since it uses less digits than its factorization.

56717172155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27975.

The product of its digits is 514500, while the sum is 47.

The spelling of 56717172155 in words is "fifty-six billion, seven hundred seventeen million, one hundred seventy-two thousand, one hundred fifty-five".