85523806609 has 2 divisors, whose sum is σ = 85523806610. Its totient is φ = 85523806608.

The previous prime is 85523806607. The next prime is 85523806651. The reversal of 85523806609 is 90660832558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58868346384 + 26655460225 = 242628^2 + 163265^2 .

It is a cyclic number.

It is not a de Polignac number, because 85523806609 - 2¹ = 85523806607 is a prime.

Together with 85523806607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85523806607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42761903304 + 42761903305.

It is an arithmetic number, because the mean of its divisors is an integer number (42761903305).

Almost surely, 2^85523806609 is an apocalyptic number.

It is an amenable number.

85523806609 is a deficient number, since it is larger than the sum of its proper divisors (1).

85523806609 is an equidigital number, since it uses as much as digits as its factorization.

85523806609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 85523806609 in words is "eighty-five billion, five hundred twenty-three million, eight hundred six thousand, six hundred nine".