189945978695 has 16 divisors (see below), whose sum is σ = 248705896608. Its totient is φ = 138115117440.

The previous prime is 189945978679. The next prime is 189945978727. The reversal of 189945978695 is 596879549981.

It is not a de Polignac number, because 189945978695 - 2⁴ = 189945978679 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 15 ways as a sum of consecutive naturals, for example, 60884 + ... + 619353.

It is an arithmetic number, because the mean of its divisors is an integer number (15544118538).

Almost surely, 2^189945978695 is an apocalyptic number.

189945978695 is a deficient number, since it is larger than the sum of its proper divisors (58759917913).

189945978695 is a wasteful number, since it uses less digits than its factorization.

189945978695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685330.

The product of its digits is 1763596800, while the sum is 80.

The spelling of 189945978695 in words is "one hundred eighty-nine billion, nine hundred forty-five million, nine hundred seventy-eight thousand, six hundred ninety-five".