18775067199920 has 80 divisors (see below), whose sum is σ = 44260768796160. Its totient is φ = 7405539478272.

The previous prime is 18775067199913. The next prime is 18775067199923. The reversal of 18775067199920 is 2999176057781.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (18775067199923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3086459 + ... + 6861221.

It is an arithmetic number, because the mean of its divisors is an integer number (553259609952).

Almost surely, 2^{18775067199920} is an apocalyptic number.

18775067199920 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 18775067199920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22130384398080).

18775067199920 is an abundant number, since it is smaller than the sum of its proper divisors (25485701596240).

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

18775067199920 is a wasteful number, since it uses less digits than its factorization.

18775067199920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775642 (or 3775636 counting only the distinct ones).

The product of its (nonzero) digits is 120022560, while the sum is 71.

The spelling of 18775067199920 in words is "eighteen trillion, seven hundred seventy-five billion, sixty-seven million, one hundred ninety-nine thousand, nine hundred twenty".