66690737 has 2 divisors, whose sum is σ = 66690738. Its totient is φ = 66690736.

The previous prime is 66690733. The next prime is 66690763. The reversal of 66690737 is 73709666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35509681 + 31181056 = 5959^2 + 5584^2 .

It is a cyclic number.

It is not a de Polignac number, because 66690737 - 2² = 66690733 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66690733) 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 as a sum of consecutive naturals, namely, 33345368 + 33345369.

It is an arithmetic number, because the mean of its divisors is an integer number (33345369).

Almost surely, 2^66690737 is an apocalyptic number.

It is an amenable number.

66690737 is a deficient number, since it is larger than the sum of its proper divisors (1).

66690737 is an equidigital number, since it uses as much as digits as its factorization.

66690737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 44.

The square root of 66690737 is about 8166.4396771176. The cubic root of 66690737 is about 405.5289273760.

The spelling of 66690737 in words is "sixty-six million, six hundred ninety thousand, seven hundred thirty-seven".