18199820180 has 24 divisors (see below), whose sum is σ = 38223898440. Its totient is φ = 7279113600.

The previous prime is 18199820179. The next prime is 18199820189. The reversal of 18199820180 is 8102899181.

It can be written as a sum of positive squares in 4 ways, for example, as 12442956304 + 5756863876 = 111548^2 + 75874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199820189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152066 + ... + 243974.

It is an arithmetic number, because the mean of its divisors is an integer number (1592662435).

Almost surely, 2^18199820180 is an apocalyptic number.

18199820180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18199820180 is an abundant number, since it is smaller than the sum of its proper divisors (20024078260).

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

18199820180 is a wasteful number, since it uses less digits than its factorization.

18199820180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101819 (or 101817 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 47.

The spelling of 18199820180 in words is "eighteen billion, one hundred ninety-nine million, eight hundred twenty thousand, one hundred eighty".