18665827680 has 48 divisors (see below), whose sum is σ = 58797358704. Its totient is φ = 4977553920.

The previous prime is 18665827679. The next prime is 18665827723. The reversal of 18665827680 is 8672856681.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18665827680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19443091 + ... + 19444050.

It is an arithmetic number, because the mean of its divisors is an integer number (1224944973).

Almost surely, 2^18665827680 is an apocalyptic number.

18665827680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18665827680 is an abundant number, since it is smaller than the sum of its proper divisors (40131531024).

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

18665827680 is a wasteful number, since it uses less digits than its factorization.

18665827680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38887159 (or 38887151 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 18665827680 in words is "eighteen billion, six hundred sixty-five million, eight hundred twenty-seven thousand, six hundred eighty".