18891169920 has 1152 divisors, whose sum is σ = 82027632960. Its totient is φ = 4138573824.

The previous prime is 18891169909. The next prime is 18891169943. The reversal of 18891169920 is 2996119881.

It is a tau number, because it is divible by the number of its divisors (1152).

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 143 ways as a sum of consecutive naturals, for example, 281957727 + ... + 281957793.

Almost surely, 2^18891169920 is an apocalyptic number.

18891169920 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 18891169920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41013816480).

18891169920 is an abundant number, since it is smaller than the sum of its proper divisors (63136463040).

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

18891169920 is an equidigital number, since it uses as much as digits as its factorization.

18891169920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 54.

The spelling of 18891169920 in words is "eighteen billion, eight hundred ninety-one million, one hundred sixty-nine thousand, nine hundred twenty".