19918375380 has 72 divisors (see below), whose sum is σ = 63973144872. Its totient is φ = 4999120896.

The previous prime is 19918375357. The next prime is 19918375391. The reversal of 19918375380 is 8357381991.

19918375380 is a `hidden beast` number, since 1 + 99 + 18 + 3 + 7 + 538 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7220240784 + 12698134596 = 84972^2 + 112686^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3251577 + ... + 3257696.

It is an arithmetic number, because the mean of its divisors is an integer number (888515901).

Almost surely, 2^19918375380 is an apocalyptic number.

19918375380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19918375380 is an abundant number, since it is smaller than the sum of its proper divisors (44054769492).

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

19918375380 is a wasteful number, since it uses less digits than its factorization.

19918375380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509305 (or 6509300 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 19918375380 in words is "nineteen billion, nine hundred eighteen million, three hundred seventy-five thousand, three hundred eighty".