18946327680 has 640 divisors, whose sum is σ = 78198912000. Its totient is φ = 4281901056.

The previous prime is 18946327669. The next prime is 18946327727. The reversal of 18946327680 is 8672364981.

18946327680 is a `hidden beast` number, since 1 + 89 + 463 + 27 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 39553681 + ... + 39554159.

It is an arithmetic number, because the mean of its divisors is an integer number (122185800).

Almost surely, 2^18946327680 is an apocalyptic number.

18946327680 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 18946327680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39099456000).

18946327680 is an abundant number, since it is smaller than the sum of its proper divisors (59252584320).

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

18946327680 is a wasteful number, since it uses less digits than its factorization.

18946327680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 18946327680 in words is "eighteen billion, nine hundred forty-six million, three hundred twenty-seven thousand, six hundred eighty".