18598140625 has 21 divisors (see below), whose sum is σ = 23268706063. Its totient is φ = 14864875000.

The previous prime is 18598140623. The next prime is 18598140643. The reversal of 18598140625 is 52604189581.

The square root of 18598140625 is 136375.

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

It can be written as a sum of positive squares in 3 ways, for example, as 16293756609 + 2304384016 = 127647^2 + 48004^2 .

It is not a de Polignac number, because 18598140625 - 2¹ = 18598140623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18598140623) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 17046330 + ... + 17047420.

Almost surely, 2^18598140625 is an apocalyptic number.

18598140625 is the 136375-th square number.

18598140625 is the 68188-th centered octagonal number.

It is an amenable number.

18598140625 is a deficient number, since it is larger than the sum of its proper divisors (4670565438).

18598140625 is an frugal number, since it uses more digits than its factorization.

18598140625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 49.

Multiplying 18598140625 by its sum of digits (49), we get a square (911308890625 = 954625²).

The spelling of 18598140625 in words is "eighteen billion, five hundred ninety-eight million, one hundred forty thousand, six hundred twenty-five".