66166229 has 2 divisors, whose sum is σ = 66166230. Its totient is φ = 66166228.

The previous prime is 66166223. The next prime is 66166231. The reversal of 66166229 is 92266166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57912100 + 8254129 = 7610^2 + 2873^2 .

It is a cyclic number.

It is not a de Polignac number, because 66166229 - 2⁸ = 66165973 is a prime.

Together with 66166231, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66166192 and 66166201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66166223) 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, 33083114 + 33083115.

It is an arithmetic number, because the mean of its divisors is an integer number (33083115).

Almost surely, 2^66166229 is an apocalyptic number.

It is an amenable number.

66166229 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166229 is an equidigital number, since it uses as much as digits as its factorization.

66166229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 66166229 is about 8134.2626586557. The cubic root of 66166229 is about 404.4629960501.

The spelling of 66166229 in words is "sixty-six million, one hundred sixty-six thousand, two hundred twenty-nine".