66394241 has 2 divisors, whose sum is σ = 66394242. Its totient is φ = 66394240.

The previous prime is 66394217. The next prime is 66394271. The reversal of 66394241 is 14249366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66080641 + 313600 = 8129^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 66394241 - 2⁶ = 66394177 is a prime.

It is a Chen prime.

It is equal to p_3918185 and since 66394241 and 3918185 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66394271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33197120 + 33197121.

It is an arithmetic number, because the mean of its divisors is an integer number (33197121).

Almost surely, 2^66394241 is an apocalyptic number.

It is an amenable number.

66394241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66394241 is an equidigital number, since it uses as much as digits as its factorization.

66394241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 66394241 is about 8148.2661345835. The cubic root of 66394241 is about 404.9270630226.

The spelling of 66394241 in words is "sixty-six million, three hundred ninety-four thousand, two hundred forty-one".