66759668 has 24 divisors (see below), whose sum is σ = 119701512. Its totient is φ = 32569344.

The previous prime is 66759659. The next prime is 66759703. The reversal of 66759668 is 86695766.

It can be written as a sum of positive squares in 4 ways, for example, as 3429904 + 63329764 = 1852^2 + 7958^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27146 + ... + 29502.

It is an arithmetic number, because the mean of its divisors is an integer number (4987563).

Almost surely, 2^66759668 is an apocalyptic number.

It is an amenable number.

66759668 is a deficient number, since it is larger than the sum of its proper divisors (52941844).

66759668 is a wasteful number, since it uses less digits than its factorization.

66759668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2529 counting only the distinct ones).

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

The square root of 66759668 is about 8170.6589697527. The cubic root of 66759668 is about 405.6685963937.

The spelling of 66759668 in words is "sixty-six million, seven hundred fifty-nine thousand, six hundred sixty-eight".