18522737478025 has 81 divisors (see below), whose sum is σ = 26824276719093. Its totient is φ = 12675910790400.

The previous prime is 18522737478013. The next prime is 18522737478053. The reversal of 18522737478025 is 52087473722581.

The square root of 18522737478025 is 4303805.

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

It can be written as a sum of positive squares in 4 ways, for example, as 433265416441 + 18089472061584 = 658229^2 + 4253172^2 .

It is not a de Polignac number, because 18522737478025 - 2⁷ = 18522737477897 is a prime.

It is a Duffinian number.

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, 4024055374 + ... + 4024059976.

Almost surely, 2^{18522737478025} is an apocalyptic number.

18522737478025 is the 4303805-th square number.

18522737478025 is the 2151903-rd centered octagonal number.

It is an amenable number.

18522737478025 is a deficient number, since it is larger than the sum of its proper divisors (8301539241068).

18522737478025 is an frugal number, since it uses more digits than its factorization.

18522737478025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272 (or 4636 counting only the distinct ones).

The product of its (nonzero) digits is 52684800, while the sum is 61.

The spelling of 18522737478025 in words is "eighteen trillion, five hundred twenty-two billion, seven hundred thirty-seven million, four hundred seventy-eight thousand, twenty-five".