185390965189 has 8 divisors (see below), whose sum is σ = 186737082560. Its totient is φ = 184054550940.

The previous prime is 185390965183. The next prime is 185390965213. The reversal of 185390965189 is 981569093581.

It is not a de Polignac number, because 185390965189 - 2⁹ = 185390964677 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 185390965189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185390965183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2651104 + ... + 2720134.

It is an arithmetic number, because the mean of its divisors is an integer number (23342135320).

Almost surely, 2^185390965189 is an apocalyptic number.

It is an amenable number.

185390965189 is a deficient number, since it is larger than the sum of its proper divisors (1346117371).

185390965189 is an frugal number, since it uses more digits than its factorization.

185390965189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69448 (or 69170 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 64.

The spelling of 185390965189 in words is "one hundred eighty-five billion, three hundred ninety million, nine hundred sixty-five thousand, one hundred eighty-nine".