85688055709 has 2 divisors, whose sum is σ = 85688055710. Its totient is φ = 85688055708.

The previous prime is 85688055641. The next prime is 85688055721. The reversal of 85688055709 is 90755088658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82126950084 + 3561105625 = 286578^2 + 59675^2 .

It is a cyclic number.

It is not a de Polignac number, because 85688055709 - 2³³ = 77098121117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85688055799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42844027854 + 42844027855.

It is an arithmetic number, because the mean of its divisors is an integer number (42844027855).

Almost surely, 2^85688055709 is an apocalyptic number.

It is an amenable number.

85688055709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85688055709 is an equidigital number, since it uses as much as digits as its factorization.

85688055709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192000, while the sum is 61.

The spelling of 85688055709 in words is "eighty-five billion, six hundred eighty-eight million, fifty-five thousand, seven hundred nine".