18681868320 has 192 divisors, whose sum is σ = 61727049216. Its totient is φ = 4743843840.

The previous prime is 18681868267. The next prime is 18681868363. The reversal of 18681868320 is 2386818681.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 823530 + ... + 845910.

It is an arithmetic number, because the mean of its divisors is an integer number (321495048).

Almost surely, 2^18681868320 is an apocalyptic number.

18681868320 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 18681868320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30863524608).

18681868320 is an abundant number, since it is smaller than the sum of its proper divisors (43045180896).

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

18681868320 is a wasteful number, since it uses less digits than its factorization.

18681868320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22483 (or 22475 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 51.

The spelling of 18681868320 in words is "eighteen billion, six hundred eighty-one million, eight hundred sixty-eight thousand, three hundred twenty".