19158745172 has 48 divisors (see below), whose sum is σ = 39669020160. Its totient is φ = 7926066432.

The previous prime is 19158745163. The next prime is 19158745181. The reversal of 19158745172 is 27154785191.

It is an interprime number because it is at equal distance from previous prime (19158745163) and next prime (19158745181).

It is a self number, because there is not a number n which added to its sum of digits gives 19158745172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3647 + ... + 195782.

It is an arithmetic number, because the mean of its divisors is an integer number (826437920).

Almost surely, 2^19158745172 is an apocalyptic number.

It is an amenable number.

19158745172 is an abundant number, since it is smaller than the sum of its proper divisors (20510274988).

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

19158745172 is a wasteful number, since it uses less digits than its factorization.

19158745172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199560 (or 199558 counting only the distinct ones).

The product of its digits is 705600, while the sum is 50.

The spelling of 19158745172 in words is "nineteen billion, one hundred fifty-eight million, seven hundred forty-five thousand, one hundred seventy-two".