660788065 has 16 divisors (see below), whose sum is σ = 916410240. Its totient is φ = 448018560.

The previous prime is 660788053. The next prime is 660788083. The reversal of 660788065 is 560887066.

It is a happy number.

660788065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660788065 - 2⁷ = 660787937 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, 102951 + ... + 109180.

It is an arithmetic number, because the mean of its divisors is an integer number (57275640).

Almost surely, 2^660788065 is an apocalyptic number.

It is an amenable number.

660788065 is a deficient number, since it is larger than the sum of its proper divisors (255622175).

660788065 is a wasteful number, since it uses less digits than its factorization.

660788065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212232.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 660788065 is about 25705.7982758754. The cubic root of 660788065 is about 871.0051644675.

Subtracting from 660788065 its reverse (560887066), we obtain a palindrome (99900999).

The spelling of 660788065 in words is "six hundred sixty million, seven hundred eighty-eight thousand, sixty-five".