66356249 has 2 divisors, whose sum is σ = 66356250. Its totient is φ = 66356248.

The previous prime is 66356243. The next prime is 66356299. The reversal of 66356249 is 94265366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 5438224 = 7805^2 + 2332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66356249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66356243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33178124 + 33178125.

It is an arithmetic number, because the mean of its divisors is an integer number (33178125).

Almost surely, 2^66356249 is an apocalyptic number.

It is an amenable number.

66356249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66356249 is an equidigital number, since it uses as much as digits as its factorization.

66356249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 41.

The square root of 66356249 is about 8145.9345074706. The cubic root of 66356249 is about 404.8498127269.

The spelling of 66356249 in words is "sixty-six million, three hundred fifty-six thousand, two hundred forty-nine".