19891125888 has 32 divisors (see below), whose sum is σ = 52835804160. Its totient is φ = 6630375168.

The previous prime is 19891125847. The next prime is 19891125923. The reversal of 19891125888 is 88852119891.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25899520 + ... + 25900287.

It is an arithmetic number, because the mean of its divisors is an integer number (1651118880).

Almost surely, 2^19891125888 is an apocalyptic number.

It is an amenable number.

19891125888 is an abundant number, since it is smaller than the sum of its proper divisors (32944678272).

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

19891125888 is an equidigital number, since it uses as much as digits as its factorization.

19891125888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51799824 (or 51799812 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 60.

The spelling of 19891125888 in words is "nineteen billion, eight hundred ninety-one million, one hundred twenty-five thousand, eight hundred eighty-eight".