85808556689 has 2 divisors, whose sum is σ = 85808556690. Its totient is φ = 85808556688.

The previous prime is 85808556677. The next prime is 85808556773. The reversal of 85808556689 is 98665580858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57416306689 + 28392250000 = 239617^2 + 168500^2 .

It is a cyclic number.

It is not a de Polignac number, because 85808556689 - 2¹² = 85808552593 is a prime.

It is not a weakly prime, because it can be changed into another prime (85808556989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42904278344 + 42904278345.

It is an arithmetic number, because the mean of its divisors is an integer number (42904278345).

Almost surely, 2^85808556689 is an apocalyptic number.

It is an amenable number.

85808556689 is a deficient number, since it is larger than the sum of its proper divisors (1).

85808556689 is an equidigital number, since it uses as much as digits as its factorization.

85808556689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888000, while the sum is 68.

The spelling of 85808556689 in words is "eighty-five billion, eight hundred eight million, five hundred fifty-six thousand, six hundred eighty-nine".