666065629 has 2 divisors, whose sum is σ = 666065630. Its totient is φ = 666065628.

The previous prime is 666065567. The next prime is 666065711. The reversal of 666065629 is 926560666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360620100 + 305445529 = 18990^2 + 17477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666065629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666065429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333032814 + 333032815.

It is an arithmetic number, because the mean of its divisors is an integer number (333032815).

Almost surely, 2^666065629 is an apocalyptic number.

It is an amenable number.

666065629 is a deficient number, since it is larger than the sum of its proper divisors (1).

666065629 is an equidigital number, since it uses as much as digits as its factorization.

666065629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 666065629 is about 25808.2473058517. The cubic root of 666065629 is about 873.3178584203.

The spelling of 666065629 in words is "six hundred sixty-six million, sixty-five thousand, six hundred twenty-nine".