66802273 has 2 divisors, whose sum is σ = 66802274. Its totient is φ = 66802272.

The previous prime is 66802247. The next prime is 66802289. The reversal of 66802273 is 37220866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56670784 + 10131489 = 7528^2 + 3183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66802273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66802223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33401136 + 33401137.

It is an arithmetic number, because the mean of its divisors is an integer number (33401137).

Almost surely, 2^66802273 is an apocalyptic number.

It is an amenable number.

66802273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66802273 is an equidigital number, since it uses as much as digits as its factorization.

66802273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 66802273 is about 8173.2657487690. The cubic root of 66802273 is about 405.7548752089.

The spelling of 66802273 in words is "sixty-six million, eight hundred two thousand, two hundred seventy-three".