18870466320225 has 81 divisors (see below), whose sum is σ = 36600670479243. Its totient is φ = 9289658701440.

The previous prime is 18870466320197. The next prime is 18870466320247. The reversal of 18870466320225 is 52202366407881.

The square root of 18870466320225 is 4344015.

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

18870466320225 is a `hidden beast` number, since 1 + 88 + 70 + 466 + 32 + 0 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 12502454446161 + 6368011874064 = 3535881^2 + 2523492^2 .

It is not a de Polignac number, because 18870466320225 - 2⁵ = 18870466320193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 847071787 + ... + 847094063.

Almost surely, 2^{18870466320225} is an apocalyptic number.

18870466320225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18870466320225 is the 4344015-th square number.

18870466320225 is the 2172008-th centered octagonal number.

It is an amenable number.

18870466320225 is a deficient number, since it is larger than the sum of its proper divisors (17730204159018).

18870466320225 is an frugal number, since it uses more digits than its factorization.

18870466320225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44596 (or 22298 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 18870466320225 in words is "eighteen trillion, eight hundred seventy billion, four hundred sixty-six million, three hundred twenty thousand, two hundred twenty-five".