18011122825 has 6 divisors (see below), whose sum is σ = 22333792334. Its totient is φ = 14408898240.

The previous prime is 18011122783. The next prime is 18011122879. The reversal of 18011122825 is 52822111081.

It can be written as a sum of positive squares in 3 ways, for example, as 1792590921 + 16218531904 = 42339^2 + 127352^2 .

It is not a de Polignac number, because 18011122825 - 2⁷ = 18011122697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360222432 + ... + 360222481.

Almost surely, 2^18011122825 is an apocalyptic number.

It is an amenable number.

18011122825 is a deficient number, since it is larger than the sum of its proper divisors (4322669509).

18011122825 is an equidigital number, since it uses as much as digits as its factorization.

18011122825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720444923 (or 720444918 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 31.

The spelling of 18011122825 in words is "eighteen billion, eleven million, one hundred twenty-two thousand, eight hundred twenty-five".