65999995 has 16 divisors (see below), whose sum is σ = 83312640. Its totient is φ = 50095584.

The previous prime is 65999993. The next prime is 66000007. The reversal of 65999995 is 59999956.

It is a cyclic number.

It is not a de Polignac number, because 65999995 - 2¹ = 65999993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12346 + ... + 16864.

It is an arithmetic number, because the mean of its divisors is an integer number (5207040).

Almost surely, 2^65999995 is an apocalyptic number.

65999995 is a deficient number, since it is larger than the sum of its proper divisors (17312645).

65999995 is a wasteful number, since it uses less digits than its factorization.

65999995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674.

The product of its digits is 8857350, while the sum is 61.

The square root of 65999995 is about 8124.0380969072. The cubic root of 65999995 is about 404.1239918571.

The spelling of 65999995 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred ninety-five".