85861596661 has 2 divisors, whose sum is σ = 85861596662. Its totient is φ = 85861596660.

The previous prime is 85861596659. The next prime is 85861596749. The reversal of 85861596661 is 16669516858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76986826225 + 8874770436 = 277465^2 + 94206^2 .

It is a cyclic number.

It is not a de Polignac number, because 85861596661 - 2¹ = 85861596659 is a prime.

Together with 85861596659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 85861596661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85861596461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42930798330 + 42930798331.

It is an arithmetic number, because the mean of its divisors is an integer number (42930798331).

Almost surely, 2^85861596661 is an apocalyptic number.

It is an amenable number.

85861596661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85861596661 is an equidigital number, since it uses as much as digits as its factorization.

85861596661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18662400, while the sum is 61.

The spelling of 85861596661 in words is "eighty-five billion, eight hundred sixty-one million, five hundred ninety-six thousand, six hundred sixty-one".