19181044180 has 24 divisors (see below), whose sum is σ = 40285711368. Its totient is φ = 7671366528.

The previous prime is 19181044159. The next prime is 19181044187. The reversal of 19181044180 is 8144018191.

It can be written as a sum of positive squares in 4 ways, for example, as 1043419204 + 18137624976 = 32302^2 + 134676^2 .

It is a super-2 number, since 2×19181044180² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19181044187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93322 + ... + 216958.

It is an arithmetic number, because the mean of its divisors is an integer number (1678571307).

Almost surely, 2^19181044180 is an apocalyptic number.

19181044180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19181044180 is an abundant number, since it is smaller than the sum of its proper divisors (21104667188).

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

19181044180 is a wasteful number, since it uses less digits than its factorization.

19181044180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131403 (or 131401 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The spelling of 19181044180 in words is "nineteen billion, one hundred eighty-one million, forty-four thousand, one hundred eighty".