18056667956857 has 2 divisors, whose sum is σ = 18056667956858. Its totient is φ = 18056667956856.

The previous prime is 18056667956777. The next prime is 18056667956911. The reversal of 18056667956857 is 75865976665081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17908334366976 + 148333589881 = 4231824^2 + 385141^2 .

It is a cyclic number.

It is not a de Polignac number, because 18056667956857 - 2¹⁵ = 18056667924089 is a prime.

It is not a weakly prime, because it can be changed into another prime (18056617956857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9028333978428 + 9028333978429.

It is an arithmetic number, because the mean of its divisors is an integer number (9028333978429).

Almost surely, 2^{18056667956857} is an apocalyptic number.

It is an amenable number.

18056667956857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18056667956857 is an equidigital number, since it uses as much as digits as its factorization.

18056667956857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288000, while the sum is 79.

The spelling of 18056667956857 in words is "eighteen trillion, fifty-six billion, six hundred sixty-seven million, nine hundred fifty-six thousand, eight hundred fifty-seven".