18680980640 has 96 divisors (see below), whose sum is σ = 50470801920. Its totient is φ = 6400825344.

The previous prime is 18680980597. The next prime is 18680980691. The reversal of 18680980640 is 4608908681.

It is a happy number.

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, 2138201 + ... + 2146919.

It is an arithmetic number, because the mean of its divisors is an integer number (525737520).

Almost surely, 2^18680980640 is an apocalyptic number.

18680980640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18680980640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25235400960).

18680980640 is an abundant number, since it is smaller than the sum of its proper divisors (31789821280).

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

18680980640 is a wasteful number, since it uses less digits than its factorization.

18680980640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10654 (or 10646 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 18680980640 in words is "eighteen billion, six hundred eighty million, nine hundred eighty thousand, six hundred forty".