85336577981 has 2 divisors, whose sum is σ = 85336577982. Its totient is φ = 85336577980.

The previous prime is 85336577959. The next prime is 85336577999. The reversal of 85336577981 is 18977563358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84465796900 + 870781081 = 290630^2 + 29509^2 .

It is a cyclic number.

It is not a de Polignac number, because 85336577981 - 2³⁴ = 68156708797 is a prime.

It is a super-2 number, since 2×85336577981² (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 (85336537981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42668288990 + 42668288991.

It is an arithmetic number, because the mean of its divisors is an integer number (42668288991).

Almost surely, 2^85336577981 is an apocalyptic number.

It is an amenable number.

85336577981 is a deficient number, since it is larger than the sum of its proper divisors (1).

85336577981 is an equidigital number, since it uses as much as digits as its factorization.

85336577981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38102400, while the sum is 62.

The spelling of 85336577981 in words is "eighty-five billion, three hundred thirty-six million, five hundred seventy-seven thousand, nine hundred eighty-one".