18915228308 has 48 divisors (see below), whose sum is σ = 36111096000. Its totient is φ = 8635108608.

The previous prime is 18915228307. The next prime is 18915228323. The reversal of 18915228308 is 80382251981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18915228307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246535 + ... + 1261617.

It is an arithmetic number, because the mean of its divisors is an integer number (752314500).

Almost surely, 2^18915228308 is an apocalyptic number.

It is an amenable number.

18915228308 is a deficient number, since it is larger than the sum of its proper divisors (17195867692).

18915228308 is a wasteful number, since it uses less digits than its factorization.

18915228308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15704 (or 15702 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 18915228308 in words is "eighteen billion, nine hundred fifteen million, two hundred twenty-eight thousand, three hundred eight".