18344978624 has 56 divisors (see below), whose sum is σ = 42945881088. Its totient is φ = 7608510720.

The previous prime is 18344978609. The next prime is 18344978689. The reversal of 18344978624 is 42687944381.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 18344978624.

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, 646574 + ... + 674349.

Almost surely, 2^18344978624 is an apocalyptic number.

18344978624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18344978624 is an abundant number, since it is smaller than the sum of its proper divisors (24600902464).

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

18344978624 is a wasteful number, since it uses less digits than its factorization.

18344978624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320973 (or 1320963 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 56.

The spelling of 18344978624 in words is "eighteen billion, three hundred forty-four million, nine hundred seventy-eight thousand, six hundred twenty-four".