19819189440904 has 48 divisors (see below), whose sum is σ = 43413607446300. Its totient is φ = 8457483621888.

The previous prime is 19819189440893. The next prime is 19819189440931. The reversal of 19819189440904 is 40904498191891.

It can be written as a sum of positive squares in 2 ways, for example, as 18989636444100 + 829552996804 = 4357710^2 + 910798^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19819189440904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108404709 + ... + 108587380.

Almost surely, 2^{19819189440904} is an apocalyptic number.

19819189440904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19819189440904 is an abundant number, since it is smaller than the sum of its proper divisors (23594418005396).

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

19819189440904 is a wasteful number, since it uses less digits than its factorization.

19819189440904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216992342 (or 216992331 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 67.

The spelling of 19819189440904 in words is "nineteen trillion, eight hundred nineteen billion, one hundred eighty-nine million, four hundred forty thousand, nine hundred four".