18158910025 has 9 divisors (see below), whose sum is σ = 22517883943. Its totient is φ = 14526589000.

The previous prime is 18158910013. The next prime is 18158910037. The reversal of 18158910025 is 52001985181.

The square root of 18158910025 is 134755.

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 (18158910013) and next prime (18158910037).

It can be written as a sum of positive squares in only one way, i.e., 6537207609 + 11621702416 = 80853^2 + 107804^2 .

It is not a de Polignac number, because 18158910025 - 2¹⁵ = 18158877257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18158910025.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 660300 + ... + 687250.

Almost surely, 2^18158910025 is an apocalyptic number.

18158910025 is the 134755-th square number.

18158910025 is the 67378-th centered octagonal number.

It is an amenable number.

18158910025 is a deficient number, since it is larger than the sum of its proper divisors (4358973918).

18158910025 is an frugal number, since it uses more digits than its factorization.

18158910025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53912 (or 26956 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 40.

The spelling of 18158910025 in words is "eighteen billion, one hundred fifty-eight million, nine hundred ten thousand, twenty-five".