18934767816 has 32 divisors (see below), whose sum is σ = 47344620960. Its totient is φ = 6310562432.

The previous prime is 18934767809. The next prime is 18934767823. The reversal of 18934767816 is 61876743981.

It is an interprime number because it is at equal distance from previous prime (18934767809) and next prime (18934767823).

It is a self number, because there is not a number n which added to its sum of digits gives 18934767816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94411 + ... + 216293.

It is an arithmetic number, because the mean of its divisors is an integer number (1479519405).

Almost surely, 2^18934767816 is an apocalyptic number.

It is an amenable number.

18934767816 is an abundant number, since it is smaller than the sum of its proper divisors (28409853144).

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

18934767816 is a wasteful number, since it uses less digits than its factorization.

18934767816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128365 (or 128361 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 60.

The spelling of 18934767816 in words is "eighteen billion, nine hundred thirty-four million, seven hundred sixty-seven thousand, eight hundred sixteen".