85660109 has 2 divisors, whose sum is σ = 85660110. Its totient is φ = 85660108.

The previous prime is 85660063. The next prime is 85660117. The reversal of 85660109 is 90106658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83210884 + 2449225 = 9122^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 85660109 - 2⁸ = 85659853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85660129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42830054 + 42830055.

It is an arithmetic number, because the mean of its divisors is an integer number (42830055).

Almost surely, 2^85660109 is an apocalyptic number.

It is an amenable number.

85660109 is a deficient number, since it is larger than the sum of its proper divisors (1).

85660109 is an equidigital number, since it uses as much as digits as its factorization.

85660109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 85660109 is about 9255.2746582692. The cubic root of 85660109 is about 440.8182243869.

The spelling of 85660109 in words is "eighty-five million, six hundred sixty thousand, one hundred nine".