18785705164457 has 64 divisors (see below), whose sum is σ = 24864927436800. Its totient is φ = 13759027476480.

The previous prime is 18785705164451. The next prime is 18785705164477. The reversal of 18785705164457 is 75446150758781.

It is not a de Polignac number, because 18785705164457 - 2⁶ = 18785705164393 is a prime.

It is a super-2 number, since 2×18785705164457² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18785705164451) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48337169 + ... + 48724257.

It is an arithmetic number, because the mean of its divisors is an integer number (388514491200).

Almost surely, 2^{18785705164457} is an apocalyptic number.

It is an amenable number.

18785705164457 is a deficient number, since it is larger than the sum of its proper divisors (6079222272343).

18785705164457 is a wasteful number, since it uses less digits than its factorization.

18785705164457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387606.

The product of its (nonzero) digits is 263424000, while the sum is 68.

The spelling of 18785705164457 in words is "eighteen trillion, seven hundred eighty-five billion, seven hundred five million, one hundred sixty-four thousand, four hundred fifty-seven".