85665565 has 8 divisors (see below), whose sum is σ = 106343640. Its totient is φ = 66169152.

The previous prime is 85665557. The next prime is 85665571. The reversal of 85665565 is 56556658.

It can be written as a sum of positive squares in 4 ways, for example, as 251001 + 85414564 = 501^2 + 9242^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85665565 - 2³ = 85665557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295254 + ... + 295543.

It is an arithmetic number, because the mean of its divisors is an integer number (13292955).

Almost surely, 2^85665565 is an apocalyptic number.

It is an amenable number.

85665565 is a deficient number, since it is larger than the sum of its proper divisors (20678075).

85665565 is a wasteful number, since it uses less digits than its factorization.

85665565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590831.

The product of its digits is 1080000, while the sum is 46.

The square root of 85665565 is about 9255.5694044181. The cubic root of 85665565 is about 440.8275832868.

The spelling of 85665565 in words is "eighty-five million, six hundred sixty-five thousand, five hundred sixty-five".