56217538571 has 2 divisors, whose sum is σ = 56217538572. Its totient is φ = 56217538570.

The previous prime is 56217538567. The next prime is 56217538603. The reversal of 56217538571 is 17583571265.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56217538571 - 2² = 56217538567 is a prime.

It is not a weakly prime, because it can be changed into another prime (56217538511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28108769285 + 28108769286.

It is an arithmetic number, because the mean of its divisors is an integer number (28108769286).

Almost surely, 2^56217538571 is an apocalyptic number.

56217538571 is a deficient number, since it is larger than the sum of its proper divisors (1).

56217538571 is an equidigital number, since it uses as much as digits as its factorization.

56217538571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 50.

The spelling of 56217538571 in words is "fifty-six billion, two hundred seventeen million, five hundred thirty-eight thousand, five hundred seventy-one".