85646258641 has 2 divisors, whose sum is σ = 85646258642. Its totient is φ = 85646258640.

The previous prime is 85646258609. The next prime is 85646258683. The reversal of 85646258641 is 14685264658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79634582416 + 6011676225 = 282196^2 + 77535^2 .

It is a cyclic number.

It is not a de Polignac number, because 85646258641 - 2⁵ = 85646258609 is a prime.

It is not a weakly prime, because it can be changed into another prime (85646258141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42823129320 + 42823129321.

It is an arithmetic number, because the mean of its divisors is an integer number (42823129321).

Almost surely, 2^85646258641 is an apocalyptic number.

It is an amenable number.

85646258641 is a deficient number, since it is larger than the sum of its proper divisors (1).

85646258641 is an equidigital number, since it uses as much as digits as its factorization.

85646258641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11059200, while the sum is 55.

The spelling of 85646258641 in words is "eighty-five billion, six hundred forty-six million, two hundred fifty-eight thousand, six hundred forty-one".