65999985 has 32 divisors (see below), whose sum is σ = 108656640. Its totient is φ = 34193088.

The previous prime is 65999951. The next prime is 65999993. The reversal of 65999985 is 58999956.

It is not a de Polignac number, because 65999985 - 2¹¹ = 65997937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125934 + ... + 126456.

It is an arithmetic number, because the mean of its divisors is an integer number (3395520).

Almost surely, 2^65999985 is an apocalyptic number.

It is an amenable number.

65999985 is a deficient number, since it is larger than the sum of its proper divisors (42656655).

65999985 is a wasteful number, since it uses less digits than its factorization.

65999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its digits is 7873200, while the sum is 60.

The square root of 65999985 is about 8124.0374814497. The cubic root of 65999985 is about 404.1239714468.

The spelling of 65999985 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred eighty-five".