85660217 has 4 divisors (see below), whose sum is σ = 87975396. Its totient is φ = 83345040.

The previous prime is 85660213. The next prime is 85660219. The reversal of 85660217 is 71206658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31181056 + 54479161 = 5584^2 + 7381^2 .

It is a cyclic number.

It is not a de Polignac number, because 85660217 - 2² = 85660213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85660213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157534 + ... + 1157607.

It is an arithmetic number, because the mean of its divisors is an integer number (21993849).

Almost surely, 2^85660217 is an apocalyptic number.

It is an amenable number.

85660217 is a deficient number, since it is larger than the sum of its proper divisors (2315179).

85660217 is a wasteful number, since it uses less digits than its factorization.

85660217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315178.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 85660217 is about 9255.2804927782. The cubic root of 85660217 is about 440.8184096475.

The spelling of 85660217 in words is "eighty-five million, six hundred sixty thousand, two hundred seventeen".