18156785316 has 48 divisors (see below), whose sum is σ = 43236614400. Its totient is φ = 5928592032.

The previous prime is 18156785293. The next prime is 18156785329. The reversal of 18156785316 is 61358765181.

It is a super-2 number, since 2×18156785316² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155055 + ... + 245673.

It is an arithmetic number, because the mean of its divisors is an integer number (900762800).

Almost surely, 2^18156785316 is an apocalyptic number.

It is an amenable number.

18156785316 is an abundant number, since it is smaller than the sum of its proper divisors (25079829084).

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

18156785316 is a wasteful number, since it uses less digits than its factorization.

18156785316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90968 (or 90966 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 51.

The spelling of 18156785316 in words is "eighteen billion, one hundred fifty-six million, seven hundred eighty-five thousand, three hundred sixteen".