66508768 has 12 divisors (see below), whose sum is σ = 130939200. Its totient is φ = 33254368.

The previous prime is 66508763. The next prime is 66508789. The reversal of 66508768 is 86780566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66508763) 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 as a sum of consecutive naturals, namely, 1039168 + ... + 1039231.

It is an arithmetic number, because the mean of its divisors is an integer number (10911600).

Almost surely, 2^66508768 is an apocalyptic number.

It is an amenable number.

66508768 is a deficient number, since it is larger than the sum of its proper divisors (64430432).

66508768 is a wasteful number, since it uses less digits than its factorization.

66508768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078409 (or 2078401 counting only the distinct ones).

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

The square root of 66508768 is about 8155.2907980035. The cubic root of 66508768 is about 405.1597561077.

It can be divided in two parts, 66508 and 768, that added together give a palindrome (67276).

The spelling of 66508768 in words is "sixty-six million, five hundred eight thousand, seven hundred sixty-eight".