18109967680 has 112 divisors (see below), whose sum is σ = 49353459840. Its totient is φ = 6200506368.

The previous prime is 18109967671. The next prime is 18109967749. The reversal of 18109967680 is 8676990181.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1726291 + ... + 1736749.

Almost surely, 2^18109967680 is an apocalyptic number.

18109967680 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 18109967680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24676729920).

18109967680 is an abundant number, since it is smaller than the sum of its proper divisors (31243492160).

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

18109967680 is a wasteful number, since it uses less digits than its factorization.

18109967680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11256 (or 11246 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 55.

The spelling of 18109967680 in words is "eighteen billion, one hundred nine million, nine hundred sixty-seven thousand, six hundred eighty".