85968239909 has 2 divisors, whose sum is σ = 85968239910. Its totient is φ = 85968239908.

The previous prime is 85968239893. The next prime is 85968239923. The reversal of 85968239909 is 90993286958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60511080100 + 25457159809 = 245990^2 + 159553^2 .

It is a cyclic number.

It is not a de Polignac number, because 85968239909 - 2⁴ = 85968239893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85968239009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42984119954 + 42984119955.

It is an arithmetic number, because the mean of its divisors is an integer number (42984119955).

Almost surely, 2^85968239909 is an apocalyptic number.

It is an amenable number.

85968239909 is a deficient number, since it is larger than the sum of its proper divisors (1).

85968239909 is an equidigital number, since it uses as much as digits as its factorization.

85968239909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75582720, while the sum is 68.

The spelling of 85968239909 in words is "eighty-five billion, nine hundred sixty-eight million, two hundred thirty-nine thousand, nine hundred nine".