66000065 has 8 divisors (see below), whose sum is σ = 79271808. Its totient is φ = 52752240.

The previous prime is 66000049. The next prime is 66000071. The reversal of 66000065 is 56000066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66000065 - 2⁴ = 66000049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66000065.

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, 794 + ... + 11516.

It is an arithmetic number, because the mean of its divisors is an integer number (9908976).

Almost surely, 2^66000065 is an apocalyptic number.

It is an amenable number.

66000065 is a deficient number, since it is larger than the sum of its proper divisors (13271743).

66000065 is a wasteful number, since it uses less digits than its factorization.

66000065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 66000065 is about 8124.0424051084. The cubic root of 66000065 is about 404.1241347291.

Subtracting from 66000065 its reverse (56000066), we obtain a palindrome (9999999).

The spelling of 66000065 in words is "sixty-six million, sixty-five", and thus it is an aban number and an uban number.