66569768 has 16 divisors (see below), whose sum is σ = 131388000. Its totient is φ = 31532976.

The previous prime is 66569747. The next prime is 66569777. The reversal of 66569768 is 86796566.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218828 + ... + 219131.

It is an arithmetic number, because the mean of its divisors is an integer number (8211750).

Almost surely, 2^66569768 is an apocalyptic number.

It is an amenable number.

66569768 is a deficient number, since it is larger than the sum of its proper divisors (64818232).

66569768 is a wasteful number, since it uses less digits than its factorization.

66569768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437984 (or 437980 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 53.

The square root of 66569768 is about 8159.0298442891. The cubic root of 66569768 is about 405.2835853602.

The spelling of 66569768 in words is "sixty-six million, five hundred sixty-nine thousand, seven hundred sixty-eight".