18418321680 has 80 divisors (see below), whose sum is σ = 62287424064. Its totient is φ = 4465047040.

The previous prime is 18418321667. The next prime is 18418321697. The reversal of 18418321680 is 8612381481.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3485679 + ... + 3490958.

Almost surely, 2^18418321680 is an apocalyptic number.

18418321680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18418321680 is an abundant number, since it is smaller than the sum of its proper divisors (43869102384).

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

18418321680 is a wasteful number, since it uses less digits than its factorization.

18418321680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6976664 (or 6976658 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The spelling of 18418321680 in words is "eighteen billion, four hundred eighteen million, three hundred twenty-one thousand, six hundred eighty".