85664893 has 2 divisors, whose sum is σ = 85664894. Its totient is φ = 85664892.

The previous prime is 85664849. The next prime is 85664899. The reversal of 85664893 is 39846658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68508729 + 17156164 = 8277^2 + 4142^2 .

It is a cyclic number.

It is not a de Polignac number, because 85664893 - 2¹⁷ = 85533821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85664899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42832446 + 42832447.

It is an arithmetic number, because the mean of its divisors is an integer number (42832447).

Almost surely, 2^85664893 is an apocalyptic number.

It is an amenable number.

85664893 is a deficient number, since it is larger than the sum of its proper divisors (1).

85664893 is an equidigital number, since it uses as much as digits as its factorization.

85664893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 85664893 is about 9255.5331018802. The cubic root of 85664893 is about 440.8264305992.

The spelling of 85664893 in words is "eighty-five million, six hundred sixty-four thousand, eight hundred ninety-three".