66826229 has 2 divisors, whose sum is σ = 66826230. Its totient is φ = 66826228.

The previous prime is 66826183. The next prime is 66826231. The reversal of 66826229 is 92262866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35129329 + 31696900 = 5927^2 + 5630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66826229 is a prime.

Together with 66826231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66826259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33413114 + 33413115.

It is an arithmetic number, because the mean of its divisors is an integer number (33413115).

Almost surely, 2^66826229 is an apocalyptic number.

It is an amenable number.

66826229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66826229 is an equidigital number, since it uses as much as digits as its factorization.

66826229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 66826229 is about 8174.7311270769. The cubic root of 66826229 is about 405.8033720721.

The spelling of 66826229 in words is "sixty-six million, eight hundred twenty-six thousand, two hundred twenty-nine".