18972247680 has 320 divisors, whose sum is σ = 68912791200. Its totient is φ = 4972713984.

The previous prime is 18972247667. The next prime is 18972247699. The reversal of 18972247680 is 8674227981.

It is a happy number.

18972247680 is a `hidden beast` number, since 1 + 8 + 97 + 2 + 2 + 476 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

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 39 ways as a sum of consecutive naturals, for example, 3055459 + ... + 3061661.

Almost surely, 2^18972247680 is an apocalyptic number.

18972247680 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 18972247680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34456395600).

18972247680 is an abundant number, since it is smaller than the sum of its proper divisors (49940543520).

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

18972247680 is an equidigital number, since it uses as much as digits as its factorization.

18972247680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6293 (or 6272 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 18972247680 in words is "eighteen billion, nine hundred seventy-two million, two hundred forty-seven thousand, six hundred eighty".