19891925225 has 12 divisors (see below), whose sum is σ = 25084056720. Its totient is φ = 15643818000.

The previous prime is 19891925171. The next prime is 19891925257. The reversal of 19891925225 is 52252919891.

It is not a de Polignac number, because 19891925225 - 2²⁴ = 19875148009 is a prime.

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, 6741551 + ... + 6744500.

It is an arithmetic number, because the mean of its divisors is an integer number (2090338060).

Almost surely, 2^19891925225 is an apocalyptic number.

It is an amenable number.

19891925225 is a deficient number, since it is larger than the sum of its proper divisors (5192131495).

19891925225 is a wasteful number, since it uses less digits than its factorization.

19891925225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13486120 (or 13486115 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 53.

The spelling of 19891925225 in words is "nineteen billion, eight hundred ninety-one million, nine hundred twenty-five thousand, two hundred twenty-five".