65986664 has 16 divisors (see below), whose sum is σ = 123811620. Its totient is φ = 32970240.

The previous prime is 65986621. The next prime is 65986681. The reversal of 65986664 is 46668956.

It can be written as a sum of positive squares in 2 ways, for example, as 63329764 + 2656900 = 7958^2 + 1630^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19154 + ... + 22334.

Almost surely, 2^65986664 is an apocalyptic number.

It is an amenable number.

65986664 is a deficient number, since it is larger than the sum of its proper divisors (57824956).

65986664 is a wasteful number, since it uses less digits than its factorization.

65986664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780 (or 5776 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 50.

The square root of 65986664 is about 8123.2175891084. The cubic root of 65986664 is about 404.0967810484.

The spelling of 65986664 in words is "sixty-five million, nine hundred eighty-six thousand, six hundred sixty-four".