190640785991 has 16 divisors (see below), whose sum is σ = 193185527808. Its totient is φ = 188118093600.

The previous prime is 190640785969. The next prime is 190640785997. The reversal of 190640785991 is 199587046091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190640785991 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 190640785991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190640785997) 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 15 ways as a sum of consecutive naturals, for example, 12545300 + ... + 12560486.

It is an arithmetic number, because the mean of its divisors is an integer number (12074095488).

Almost surely, 2^190640785991 is an apocalyptic number.

190640785991 is a deficient number, since it is larger than the sum of its proper divisors (2544741817).

190640785991 is a wasteful number, since it uses less digits than its factorization.

190640785991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15902.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The spelling of 190640785991 in words is "one hundred ninety billion, six hundred forty million, seven hundred eighty-five thousand, nine hundred ninety-one".