18421159680 has 864 divisors, whose sum is σ = 83720931840. Its totient is φ = 3622993920.

The previous prime is 18421159613. The next prime is 18421159681. The reversal of 18421159680 is 8695112481.

It is a happy number.

18421159680 is a `hidden beast` number, since 1 + 8 + 42 + 11 + 596 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421159681) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16853214 + ... + 16854306.

Almost surely, 2^18421159680 is an apocalyptic number.

18421159680 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 18421159680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41860465920).

18421159680 is an abundant number, since it is smaller than the sum of its proper divisors (65299772160).

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

18421159680 is a wasteful number, since it uses less digits than its factorization.

18421159680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 18421159680 in words is "eighteen billion, four hundred twenty-one million, one hundred fifty-nine thousand, six hundred eighty".