85665601 has 16 divisors (see below), whose sum is σ = 104232960. Its totient is φ = 68728320.

The previous prime is 85665599. The next prime is 85665659. The reversal of 85665601 is 10656658.

It is a cyclic number.

It is not a de Polignac number, because 85665601 - 2¹ = 85665599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85665301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20845 + ... + 24613.

It is an arithmetic number, because the mean of its divisors is an integer number (6514560).

Almost surely, 2^85665601 is an apocalyptic number.

It is an amenable number.

85665601 is a deficient number, since it is larger than the sum of its proper divisors (18567359).

85665601 is a wasteful number, since it uses less digits than its factorization.

85665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 85665601 is about 9255.5713491929. The cubic root of 85665601 is about 440.8276450378.

The spelling of 85665601 in words is "eighty-five million, six hundred sixty-five thousand, six hundred one".