85665567 has 16 divisors (see below), whose sum is σ = 130243680. Its totient is φ = 49615872.

The previous prime is 85665557. The next prime is 85665571. The reversal of 85665567 is 76556658.

It is not a de Polignac number, because 85665567 - 2⁴ = 85665551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85665527) 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, 63942 + ... + 65267.

It is an arithmetic number, because the mean of its divisors is an integer number (8140230).

Almost surely, 2^85665567 is an apocalyptic number.

85665567 is a deficient number, since it is larger than the sum of its proper divisors (44578113).

85665567 is a wasteful number, since it uses less digits than its factorization.

85665567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129242.

The product of its digits is 1512000, while the sum is 48.

The square root of 85665567 is about 9255.5695124611. The cubic root of 85665567 is about 440.8275867174.

The spelling of 85665567 in words is "eighty-five million, six hundred sixty-five thousand, five hundred sixty-seven".