168786814971981 has 16 divisors (see below), whose sum is σ = 227278095811200. Its totient is φ = 111410046571200.

The previous prime is 168786814971913. The next prime is 168786814971997. The reversal of 168786814971981 is 189179418687861.

It is a happy number.

It is not a de Polignac number, because 168786814971981 - 2²² = 168786810777677 is a prime.

It is a super-2 number, since 2×168786814971981² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 168786814971894 and 168786814971903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168786814971581) 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, 103551495 + ... + 105168843.

It is an arithmetic number, because the mean of its divisors is an integer number (14204880988200).

Almost surely, 2^{168786814971981} is an apocalyptic number.

It is an amenable number.

168786814971981 is a deficient number, since it is larger than the sum of its proper divisors (58491280839219).

168786814971981 is a wasteful number, since it uses less digits than its factorization.

168786814971981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961876.

The product of its digits is 2341011456, while the sum is 84.

The spelling of 168786814971981 in words is "one hundred sixty-eight trillion, seven hundred eighty-six billion, eight hundred fourteen million, nine hundred seventy-one thousand, nine hundred eighty-one".