85664899 has 2 divisors, whose sum is σ = 85664900. Its totient is φ = 85664898.

The previous prime is 85664893. The next prime is 85664951. The reversal of 85664899 is 99846658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85664899 - 2⁷ = 85664771 is a prime.

It is not a weakly prime, because it can be changed into another prime (85664893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42832449 + 42832450.

It is an arithmetic number, because the mean of its divisors is an integer number (42832450).

Almost surely, 2^85664899 is an apocalyptic number.

85664899 is a deficient number, since it is larger than the sum of its proper divisors (1).

85664899 is an equidigital number, since it uses as much as digits as its factorization.

85664899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 55.

The square root of 85664899 is about 9255.5334260106. The cubic root of 85664899 is about 440.8264408911.

The spelling of 85664899 in words is "eighty-five million, six hundred sixty-four thousand, eight hundred ninety-nine".