66759664 has 10 divisors (see below), whose sum is σ = 129346880. Its totient is φ = 33379824.

The previous prime is 66759659. The next prime is 66759703. The reversal of 66759664 is 46695766.

It is a zygodrome in base 4.

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, 2086224 + ... + 2086255.

It is an arithmetic number, because the mean of its divisors is an integer number (12934688).

Almost surely, 2^66759664 is an apocalyptic number.

It is an amenable number.

66759664 is a deficient number, since it is larger than the sum of its proper divisors (62587216).

66759664 is a wasteful number, since it uses less digits than its factorization.

66759664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172487 (or 4172481 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 49.

The square root of 66759664 is about 8170.6587249744. The cubic root of 66759664 is about 405.6685882917.

The spelling of 66759664 in words is "sixty-six million, seven hundred fifty-nine thousand, six hundred sixty-four".