19878558894 has 32 divisors (see below), whose sum is σ = 44299758240. Its totient is φ = 6607408896.

The previous prime is 19878558857. The next prime is 19878558899. The reversal of 19878558894 is 49885587891.

19878558894 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19878558899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502357 + ... + 540480.

It is an arithmetic number, because the mean of its divisors is an integer number (1384367445).

Almost surely, 2^19878558894 is an apocalyptic number.

19878558894 is an abundant number, since it is smaller than the sum of its proper divisors (24421199346).

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

19878558894 is a wasteful number, since it uses less digits than its factorization.

19878558894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043201 (or 1043195 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 72.

The spelling of 19878558894 in words is "nineteen billion, eight hundred seventy-eight million, five hundred fifty-eight thousand, eight hundred ninety-four".