66600829 has 2 divisors, whose sum is σ = 66600830. Its totient is φ = 66600828.

The previous prime is 66600827. The next prime is 66600899. The reversal of 66600829 is 92800666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52925625 + 13675204 = 7275^2 + 3698^2 .

It is a cyclic number.

It is not a de Polignac number, because 66600829 - 2¹ = 66600827 is a prime.

Together with 66600827, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66600823) 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, 33300414 + 33300415.

It is an arithmetic number, because the mean of its divisors is an integer number (33300415).

Almost surely, 2^66600829 is an apocalyptic number.

It is an amenable number.

66600829 is a deficient number, since it is larger than the sum of its proper divisors (1).

66600829 is an equidigital number, since it uses as much as digits as its factorization.

66600829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 66600829 is about 8160.9330961600. The cubic root of 66600829 is about 405.3466097451.

The spelling of 66600829 in words is "sixty-six million, six hundred thousand, eight hundred twenty-nine".