66566768 has 10 divisors (see below), whose sum is σ = 128973144. Its totient is φ = 33283376.

The previous prime is 66566723. The next prime is 66566779. The reversal of 66566768 is 86766566.

It is a super-2 number, since 2×66566768² = 8862269203931648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 2080196 + ... + 2080227.

Almost surely, 2^66566768 is an apocalyptic number.

It is an amenable number.

66566768 is a deficient number, since it is larger than the sum of its proper divisors (62406376).

66566768 is a wasteful number, since it uses less digits than its factorization.

66566768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160431 (or 4160425 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The square root of 66566768 is about 8158.8459968307. The cubic root of 66566768 is about 405.2774971660.

The spelling of 66566768 in words is "sixty-six million, five hundred sixty-six thousand, seven hundred sixty-eight".