18640035216 has 60 divisors (see below), whose sum is σ = 56908597200. Its totient is φ = 5648495040.

The previous prime is 18640035191. The next prime is 18640035221. The reversal of 18640035216 is 61253004681.

It is a happy number.

18640035216 is a `hidden beast` number, since 1 + 8 + 6 + 400 + 35 + 216 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5882266 + ... + 5885433.

It is an arithmetic number, because the mean of its divisors is an integer number (948476620).

Almost surely, 2^18640035216 is an apocalyptic number.

18640035216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18640035216 is an abundant number, since it is smaller than the sum of its proper divisors (38268561984).

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

18640035216 is a wasteful number, since it uses less digits than its factorization.

18640035216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11767724 (or 11767715 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 18640035216 its reverse (61253004681), we get a palindrome (79893039897).

The spelling of 18640035216 in words is "eighteen billion, six hundred forty million, thirty-five thousand, two hundred sixteen".