168807977431 has 32 divisors (see below), whose sum is σ = 181919232000. Its totient is φ = 156338719488.

The previous prime is 168807977423. The next prime is 168807977441. The reversal of 168807977431 is 134779708861.

It is a cyclic number.

It is not a de Polignac number, because 168807977431 - 2³ = 168807977423 is a prime.

It is a super-2 number, since 2×168807977431² (a number of 23 digits) contains 22 as substring.

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 168807977431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168807977441) 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 31 ways as a sum of consecutive naturals, for example, 21752530 + ... + 21760288.

It is an arithmetic number, because the mean of its divisors is an integer number (5684976000).

Almost surely, 2^168807977431 is an apocalyptic number.

168807977431 is a deficient number, since it is larger than the sum of its proper divisors (13111254569).

168807977431 is a wasteful number, since it uses less digits than its factorization.

168807977431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8143.

The product of its (nonzero) digits is 14224896, while the sum is 61.

The spelling of 168807977431 in words is "one hundred sixty-eight billion, eight hundred seven million, nine hundred seventy-seven thousand, four hundred thirty-one".