66044065 has 16 divisors (see below), whose sum is σ = 84291840. Its totient is φ = 49504000.

The previous prime is 66044039. The next prime is 66044089. The reversal of 66044065 is 56044066.

It is not a de Polignac number, because 66044065 - 2⁹ = 66043553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18690 + ... + 21940.

It is an arithmetic number, because the mean of its divisors is an integer number (5268240).

Almost surely, 2^66044065 is an apocalyptic number.

It is an amenable number.

66044065 is a deficient number, since it is larger than the sum of its proper divisors (18247775).

66044065 is a wasteful number, since it uses less digits than its factorization.

66044065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66044065 is about 8126.7499653921. The cubic root of 66044065 is about 404.2139200547.

Subtracting from 66044065 its reverse (56044066), we obtain a palindrome (9999999).

The spelling of 66044065 in words is "sixty-six million, forty-four thousand, sixty-five".