189187172865 has 48 divisors (see below), whose sum is σ = 342678510720. Its totient is φ = 96372840960.

The previous prime is 189187172857. The next prime is 189187172873. The reversal of 189187172865 is 568271781981.

It is an interprime number because it is at equal distance from previous prime (189187172857) and next prime (189187172873).

It is not a de Polignac number, because 189187172865 - 2³ = 189187172857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 582921 + ... + 847449.

It is an arithmetic number, because the mean of its divisors is an integer number (7139135640).

Almost surely, 2^189187172865 is an apocalyptic number.

189187172865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189187172865 is a deficient number, since it is larger than the sum of its proper divisors (153491337855).

189187172865 is a wasteful number, since it uses less digits than its factorization.

189187172865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265254 (or 265251 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 63.

The spelling of 189187172865 in words is "one hundred eighty-nine billion, one hundred eighty-seven million, one hundred seventy-two thousand, eight hundred sixty-five".