18984706225 has 27 divisors (see below), whose sum is σ = 25022695971. Its totient is φ = 14285548800.

The previous prime is 18984706219. The next prime is 18984706231. The reversal of 18984706225 is 52260748981.

The square root of 18984706225 is 137785.

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

It is an interprime number because it is at equal distance from previous prime (18984706219) and next prime (18984706231).

It can be written as a sum of positive squares in 13 ways, for example, as 2213420209 + 16771286016 = 47047^2 + 129504^2 .

It is not a de Polignac number, because 18984706225 - 2³ = 18984706217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11710915 + ... + 11712535.

Almost surely, 2^18984706225 is an apocalyptic number.

18984706225 is the 137785-th square number.

18984706225 is the 68893-rd centered octagonal number.

It is an amenable number.

18984706225 is a deficient number, since it is larger than the sum of its proper divisors (6037989746).

18984706225 is an frugal number, since it uses more digits than its factorization.

18984706225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286 (or 1643 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 18984706225 in words is "eighteen billion, nine hundred eighty-four million, seven hundred six thousand, two hundred twenty-five".