199990180864791 has 16 divisors (see below), whose sum is σ = 296296547301120. Its totient is φ = 133320128200920.

The previous prime is 199990180864781. The next prime is 199990180864813. The reversal of 199990180864791 is 197468081099991.

It is a happy number.

199990180864791 is a `hidden beast` number, since 199 + 9 + 90 + 180 + 86 + 4 + 7 + 91 = 666.

It is not a de Polignac number, because 199990180864791 - 2⁵ = 199990180864759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199990180864791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199990180864781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184422765 + ... + 185504006.

It is an arithmetic number, because the mean of its divisors is an integer number (18518534206320).

Almost surely, 2^{199990180864791} is an apocalyptic number.

199990180864791 is a deficient number, since it is larger than the sum of its proper divisors (96306366436329).

199990180864791 is a wasteful number, since it uses less digits than its factorization.

199990180864791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369946803 (or 369946797 counting only the distinct ones).

The product of its (nonzero) digits is 634894848, while the sum is 81.

The spelling of 199990180864791 in words is "one hundred ninety-nine trillion, nine hundred ninety billion, one hundred eighty million, eight hundred sixty-four thousand, seven hundred ninety-one".