18215469816 has 32 divisors (see below), whose sum is σ = 45700750800. Its totient is φ = 6050213120.

The previous prime is 18215469773. The next prime is 18215469829. The reversal of 18215469816 is 61896451281.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1343751 + ... + 1357238.

Almost surely, 2^18215469816 is an apocalyptic number.

It is an amenable number.

18215469816 is an abundant number, since it is smaller than the sum of its proper divisors (27485280984).

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

18215469816 is a wasteful number, since it uses less digits than its factorization.

18215469816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701279 (or 2701275 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The spelling of 18215469816 in words is "eighteen billion, two hundred fifteen million, four hundred sixty-nine thousand, eight hundred sixteen".