18486481225 has 27 divisors (see below), whose sum is σ = 23311511719. Its totient is φ = 14542816400.

The previous prime is 18486481177. The next prime is 18486481289. The reversal of 18486481225 is 52218468481.

The square root of 18486481225 is 135965.

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

It can be written as a sum of positive squares in only one way, i.e., 6655133241 + 11831347984 = 81579^2 + 108772^2 .

It is not a de Polignac number, because 18486481225 - 2²¹ = 18484384073 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, 48267384 + ... + 48267766.

Almost surely, 2^18486481225 is an apocalyptic number.

18486481225 is the 135965-th square number.

18486481225 is the 67983-rd centered octagonal number.

It is an amenable number.

18486481225 is a deficient number, since it is larger than the sum of its proper divisors (4825030494).

18486481225 is an frugal number, since it uses more digits than its factorization.

18486481225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 459 counting only the distinct ones).

The product of its digits is 983040, while the sum is 49.

Multiplying 18486481225 by its sum of digits (49), we get a square (905837580025 = 951755²).

The spelling of 18486481225 in words is "eighteen billion, four hundred eighty-six million, four hundred eighty-one thousand, two hundred twenty-five".