56817537985 has 32 divisors (see below), whose sum is σ = 74591500032. Its totient is φ = 41292599040.

The previous prime is 56817537983. The next prime is 56817538027. The reversal of 56817537985 is 58973571865.

It is not a de Polignac number, because 56817537985 - 2¹ = 56817537983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56817537983) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5137732 + ... + 5148778.

It is an arithmetic number, because the mean of its divisors is an integer number (2330984376).

Almost surely, 2^56817537985 is an apocalyptic number.

It is an amenable number.

56817537985 is a deficient number, since it is larger than the sum of its proper divisors (17773962047).

56817537985 is a wasteful number, since it uses less digits than its factorization.

56817537985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12313.

The product of its digits is 63504000, while the sum is 64.

The spelling of 56817537985 in words is "fifty-six billion, eight hundred seventeen million, five hundred thirty-seven thousand, nine hundred eighty-five".