18156365508 has 72 divisors (see below), whose sum is σ = 44425825696. Its totient is φ = 5770828800.

The previous prime is 18156365489. The next prime is 18156365527. The reversal of 18156365508 is 80556365181.

It is an interprime number because it is at equal distance from previous prime (18156365489) and next prime (18156365527).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2096868 + ... + 2105508.

Almost surely, 2^18156365508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18156365508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22212912848).

18156365508 is an abundant number, since it is smaller than the sum of its proper divisors (26269460188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18156365508 is a wasteful number, since it uses less digits than its factorization.

18156365508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9025 (or 9000 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 48.

The spelling of 18156365508 in words is "eighteen billion, one hundred fifty-six million, three hundred sixty-five thousand, five hundred eight".