66724277 has 2 divisors, whose sum is σ = 66724278. Its totient is φ = 66724276.

The previous prime is 66724271. The next prime is 66724289. The reversal of 66724277 is 77242766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60124516 + 6599761 = 7754^2 + 2569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66724277 is a prime.

It is a Chen prime.

It is equal to p_3936497 and since 66724277 and 3936497 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66724271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33362138 + 33362139.

It is an arithmetic number, because the mean of its divisors is an integer number (33362139).

Almost surely, 2^66724277 is an apocalyptic number.

It is an amenable number.

66724277 is a deficient number, since it is larger than the sum of its proper divisors (1).

66724277 is an equidigital number, since it uses as much as digits as its factorization.

66724277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197568, while the sum is 41.

The square root of 66724277 is about 8168.4929454582. The cubic root of 66724277 is about 405.5968986383.

The spelling of 66724277 in words is "sixty-six million, seven hundred twenty-four thousand, two hundred seventy-seven".