18506173089 has 12 divisors (see below), whose sum is σ = 26211743504. Its totient is φ = 11611715904.

The previous prime is 18506173087. The next prime is 18506173099. The reversal of 18506173089 is 98037160581.

It is not a de Polignac number, because 18506173089 - 2¹ = 18506173087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18506173087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10671667 + ... + 10673400.

Almost surely, 2^18506173089 is an apocalyptic number.

It is an amenable number.

18506173089 is a deficient number, since it is larger than the sum of its proper divisors (7705570415).

18506173089 is a wasteful number, since it uses less digits than its factorization.

18506173089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21345104 (or 21345087 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 18506173089 in words is "eighteen billion, five hundred six million, one hundred seventy-three thousand, eighty-nine".