85165661 has 16 divisors (see below), whose sum is σ = 98714880. Its totient is φ = 71971200.

The previous prime is 85165637. The next prime is 85165667. The reversal of 85165661 is 16656158.

It is a de Polignac number, because none of the positive numbers 2^k-85165661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85165667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208025 + ... + 208433.

It is an arithmetic number, because the mean of its divisors is an integer number (6169680).

Almost surely, 2^85165661 is an apocalyptic number.

It is an amenable number.

85165661 is a deficient number, since it is larger than the sum of its proper divisors (13549219).

85165661 is a wasteful number, since it uses less digits than its factorization.

85165661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764.

The product of its digits is 43200, while the sum is 38.

The square root of 85165661 is about 9228.5243132367. The cubic root of 85165661 is about 439.9684223206.

The spelling of 85165661 in words is "eighty-five million, one hundred sixty-five thousand, six hundred sixty-one".