85968241981 has 2 divisors, whose sum is σ = 85968241982. Its totient is φ = 85968241980.

The previous prime is 85968241951. The next prime is 85968241993. The reversal of 85968241981 is 18914286958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57232906756 + 28735335225 = 239234^2 + 169515^2 .

It is a cyclic number.

It is not a de Polignac number, because 85968241981 - 2²³ = 85959853373 is a prime.

It is a super-2 number, since 2×85968241981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85968241951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42984120990 + 42984120991.

It is an arithmetic number, because the mean of its divisors is an integer number (42984120991).

Almost surely, 2^85968241981 is an apocalyptic number.

It is an amenable number.

85968241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

85968241981 is an equidigital number, since it uses as much as digits as its factorization.

85968241981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 61.

The spelling of 85968241981 in words is "eighty-five billion, nine hundred sixty-eight million, two hundred forty-one thousand, nine hundred eighty-one".