85665566 has 16 divisors (see below), whose sum is σ = 154584960. Its totient is φ = 34781400.

The previous prime is 85665557. The next prime is 85665571. The reversal of 85665566 is 66556658.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 85665566.

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, 160760 + ... + 161291.

It is an arithmetic number, because the mean of its divisors is an integer number (9661560).

Almost surely, 2^85665566 is an apocalyptic number.

85665566 is a deficient number, since it is larger than the sum of its proper divisors (68919394).

85665566 is a wasteful number, since it uses less digits than its factorization.

85665566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322079.

The product of its digits is 1296000, while the sum is 47.

The square root of 85665566 is about 9255.5694584396. The cubic root of 85665566 is about 440.8275850021.

The spelling of 85665566 in words is "eighty-five million, six hundred sixty-five thousand, five hundred sixty-six".