191942668585 has 16 divisors (see below), whose sum is σ = 242570655360. Its totient is φ = 145402283520.

The previous prime is 191942668579. The next prime is 191942668639. The reversal of 191942668585 is 585866249191.

It is a de Polignac number, because none of the positive numbers 2^k-191942668585 is a prime.

It is a super-2 number, since 2×191942668585² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 287757 + ... + 683146.

It is an arithmetic number, because the mean of its divisors is an integer number (15160665960).

Almost surely, 2^191942668585 is an apocalyptic number.

It is an amenable number.

191942668585 is a deficient number, since it is larger than the sum of its proper divisors (50627986775).

191942668585 is a wasteful number, since it uses less digits than its factorization.

191942668585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973008.

The product of its digits is 37324800, while the sum is 64.

The spelling of 191942668585 in words is "one hundred ninety-one billion, nine hundred forty-two million, six hundred sixty-eight thousand, five hundred eighty-five".