66745706 has 24 divisors (see below), whose sum is σ = 109263756. Its totient is φ = 30551040.

The previous prime is 66745703. The next prime is 66745711. The reversal of 66745706 is 60754766.

It can be written as a sum of positive squares in 6 ways, for example, as 42784681 + 23961025 = 6541^2 + 4895^2 .

It is not an unprimeable number, because it can be changed into a prime (66745703) 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 in 11 ways as a sum of consecutive naturals, for example, 19826 + ... + 22946.

Almost surely, 2^66745706 is an apocalyptic number.

66745706 is a deficient number, since it is larger than the sum of its proper divisors (42518050).

66745706 is a wasteful number, since it uses less digits than its factorization.

66745706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194 (or 3177 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 66745706 is about 8169.8045264253. The cubic root of 66745706 is about 405.6403141488.

The spelling of 66745706 in words is "sixty-six million, seven hundred forty-five thousand, seven hundred six".