66676429 has 2 divisors, whose sum is σ = 66676430. Its totient is φ = 66676428.

The previous prime is 66676427. The next prime is 66676447. The reversal of 66676429 is 92467666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 1954404 = 8045^2 + 1398^2 .

It is a cyclic number.

It is not a de Polignac number, because 66676429 - 2¹ = 66676427 is a prime.

Together with 66676427, 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 (66676427) 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, 33338214 + 33338215.

It is an arithmetic number, because the mean of its divisors is an integer number (33338215).

Almost surely, 2^66676429 is an apocalyptic number.

It is an amenable number.

66676429 is a deficient number, since it is larger than the sum of its proper divisors (1).

66676429 is an equidigital number, since it uses as much as digits as its factorization.

66676429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 46.

The square root of 66676429 is about 8165.5636057776. The cubic root of 66676429 is about 405.4999242333.

The spelling of 66676429 in words is "sixty-six million, six hundred seventy-six thousand, four hundred twenty-nine".