18885630625 has 45 divisors (see below), whose sum is σ = 24773814373. Its totient is φ = 14391146000.

The previous prime is 18885630619. The next prime is 18885630629. The reversal of 18885630625 is 52603658881.

The square root of 18885630625 is 137425.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 1480633441 + 17404997184 = 38479^2 + 131928^2 .

It is not a de Polignac number, because 18885630625 - 2¹⁹ = 18885106337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18885630629) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 79019256 + ... + 79019494.

Almost surely, 2^18885630625 is an apocalyptic number.

18885630625 is the 137425-th square number.

18885630625 is the 68713-rd centered octagonal number.

It is an amenable number.

18885630625 is a deficient number, since it is larger than the sum of its proper divisors (5888183748).

18885630625 is an frugal number, since it uses more digits than its factorization.

18885630625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 18885630625 in words is "eighteen billion, eight hundred eighty-five million, six hundred thirty thousand, six hundred twenty-five".