19818018180 has 72 divisors (see below), whose sum is σ = 60126138072. Its totient is φ = 5283795456.

The previous prime is 19818018133. The next prime is 19818018197. The reversal of 19818018180 is 8181081891.

It can be written as a sum of positive squares in 4 ways, for example, as 701084484 + 19116933696 = 26478^2 + 138264^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1764342 + ... + 1775538.

It is an arithmetic number, because the mean of its divisors is an integer number (835085251).

Almost surely, 2^19818018180 is an apocalyptic number.

19818018180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19818018180 is an abundant number, since it is smaller than the sum of its proper divisors (40308119892).

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

19818018180 is a wasteful number, since it uses less digits than its factorization.

19818018180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21045 (or 21040 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 45.

The spelling of 19818018180 in words is "nineteen billion, eight hundred eighteen million, eighteen thousand, one hundred eighty".