18882521665 has 12 divisors (see below), whose sum is σ = 26358459156. Its totient is φ = 12948014688.

The previous prime is 18882521657. The next prime is 18882521687. The reversal of 18882521665 is 56612528881.

It can be written as a sum of positive squares in 2 ways, for example, as 15061180176 + 3821341489 = 122724^2 + 61817^2 .

It is not a de Polignac number, because 18882521665 - 2³ = 18882521657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38535514 + ... + 38536003.

It is an arithmetic number, because the mean of its divisors is an integer number (2196538263).

Almost surely, 2^18882521665 is an apocalyptic number.

It is an amenable number.

18882521665 is a deficient number, since it is larger than the sum of its proper divisors (7475937491).

18882521665 is an equidigital number, since it uses as much as digits as its factorization.

18882521665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77071536 (or 77071529 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 52.

The spelling of 18882521665 in words is "eighteen billion, eight hundred eighty-two million, five hundred twenty-one thousand, six hundred sixty-five".