168991764399 has 20 divisors (see below), whose sum is σ = 252670625064. Its totient is φ = 112560255504.

The previous prime is 168991764379. The next prime is 168991764427. The reversal of 168991764399 is 993467199861.

It is a happy number.

168991764399 is a `hidden beast` number, since 1 + 6 + 89 + 91 + 76 + 4 + 399 = 666.

It is not a de Polignac number, because 168991764399 - 2⁵ = 168991764367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168991764379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 843417 + ... + 1024370.

Almost surely, 2^168991764399 is an apocalyptic number.

168991764399 is a deficient number, since it is larger than the sum of its proper divisors (83678860665).

168991764399 is a wasteful number, since it uses less digits than its factorization.

168991764399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868916 (or 1868907 counting only the distinct ones).

The product of its digits is 158723712, while the sum is 72.

The spelling of 168991764399 in words is "one hundred sixty-eight billion, nine hundred ninety-one million, seven hundred sixty-four thousand, three hundred ninety-nine".