189779928815 has 4 divisors (see below), whose sum is σ = 227735914584. Its totient is φ = 151823943048.

The previous prime is 189779928809. The next prime is 189779928827. The reversal of 189779928815 is 518829977981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189779928815 - 2⁴ = 189779928799 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 18977992877 + ... + 18977992886.

It is an arithmetic number, because the mean of its divisors is an integer number (56933978646).

Almost surely, 2^189779928815 is an apocalyptic number.

189779928815 is a deficient number, since it is larger than the sum of its proper divisors (37955985769).

189779928815 is an equidigital number, since it uses as much as digits as its factorization.

189779928815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37955985768.

The product of its digits is 182891520, while the sum is 74.

The spelling of 189779928815 in words is "one hundred eighty-nine billion, seven hundred seventy-nine million, nine hundred twenty-eight thousand, eight hundred fifteen".