18209571122 has 6 divisors (see below), whose sum is σ = 27314642943. Its totient is φ = 9104690142.

The previous prime is 18209571113. The next prime is 18209571161. The reversal of 18209571122 is 22117590281.

It can be written as a sum of positive squares in only one way, i.e., 9104785561 + 9104785561 = 95419^2 + 95419^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95419.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 143129 + ... + 238547.

Almost surely, 2^18209571122 is an apocalyptic number.

18209571122 is a deficient number, since it is larger than the sum of its proper divisors (9105071821).

18209571122 is an frugal number, since it uses more digits than its factorization.

18209571122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190840 (or 95421 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 18209571122 in words is "eighteen billion, two hundred nine million, five hundred seventy-one thousand, one hundred twenty-two".