85170661 has 2 divisors, whose sum is σ = 85170662. Its totient is φ = 85170660.

The previous prime is 85170649. The next prime is 85170691. The reversal of 85170661 is 16607158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47348161 + 37822500 = 6881^2 + 6150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85170661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85170641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585330 + 42585331.

It is an arithmetic number, because the mean of its divisors is an integer number (42585331).

Almost surely, 2^85170661 is an apocalyptic number.

It is an amenable number.

85170661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85170661 is an equidigital number, since it uses as much as digits as its factorization.

85170661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 85170661 is about 9228.7952084766. The cubic root of 85170661 is about 439.9770322033.

The spelling of 85170661 in words is "eighty-five million, one hundred seventy thousand, six hundred sixty-one".