18505938216 has 32 divisors (see below), whose sum is σ = 46270002240. Its totient is φ = 6167958528.

The previous prime is 18505938179. The next prime is 18505938221. The reversal of 18505938216 is 61283950581.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206365 + ... + 282131.

It is an arithmetic number, because the mean of its divisors is an integer number (1445937570).

Almost surely, 2^18505938216 is an apocalyptic number.

It is an amenable number.

18505938216 is an abundant number, since it is smaller than the sum of its proper divisors (27764064024).

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

18505938216 is a wasteful number, since it uses less digits than its factorization.

18505938216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85953 (or 85949 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 18505938216 in words is "eighteen billion, five hundred five million, nine hundred thirty-eight thousand, two hundred sixteen".