168819892706981 has 4 divisors (see below), whose sum is σ = 168819924139200. Its totient is φ = 168819861274764.

The previous prime is 168819892706917. The next prime is 168819892707029. The reversal of 168819892706981 is 189607298918861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168819892706981 - 2⁶ = 168819892706917 is a prime.

It is a super-2 number, since 2×168819892706981² (a number of 29 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 168819892706981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168819892726981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5404541 + ... + 19153298.

It is an arithmetic number, because the mean of its divisors is an integer number (42204981034800).

Almost surely, 2^{168819892706981} is an apocalyptic number.

It is an amenable number.

168819892706981 is a deficient number, since it is larger than the sum of its proper divisors (31432219).

168819892706981 is an equidigital number, since it uses as much as digits as its factorization.

168819892706981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31432218.

The product of its (nonzero) digits is 1504935936, while the sum is 83.

The spelling of 168819892706981 in words is "one hundred sixty-eight trillion, eight hundred nineteen billion, eight hundred ninety-two million, seven hundred six thousand, nine hundred eighty-one".