85613653666 has 24 divisors (see below), whose sum is σ = 133134409044. Its totient is φ = 41289420480.

The previous prime is 85613653603. The next prime is 85613653667. The reversal of 85613653666 is 66635631658.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 32654297025 + 52959356641 = 180705^2 + 230129^2 .

It is not an unprimeable number, because it can be changed into a prime (85613653667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1692396 + ... + 1742248.

Almost surely, 2^85613653666 is an apocalyptic number.

85613653666 is a deficient number, since it is larger than the sum of its proper divisors (47520755378).

85613653666 is a wasteful number, since it uses less digits than its factorization.

85613653666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50934 (or 50905 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 55.

The spelling of 85613653666 in words is "eighty-five billion, six hundred thirteen million, six hundred fifty-three thousand, six hundred sixty-six".