66564241 has 2 divisors, whose sum is σ = 66564242. Its totient is φ = 66564240.

The previous prime is 66564233. The next prime is 66564259. The reversal of 66564241 is 14246566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41011216 + 25553025 = 6404^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 66564241 - 2³ = 66564233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66564197 and 66564206.

It is not a weakly prime, because it can be changed into another prime (66564041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282120 + 33282121.

It is an arithmetic number, because the mean of its divisors is an integer number (33282121).

Almost surely, 2^66564241 is an apocalyptic number.

It is an amenable number.

66564241 is a deficient number, since it is larger than the sum of its proper divisors (1).

66564241 is an equidigital number, since it uses as much as digits as its factorization.

66564241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 66564241 is about 8158.6911327737. The cubic root of 66564241 is about 405.2723687352.

The spelling of 66564241 in words is "sixty-six million, five hundred sixty-four thousand, two hundred forty-one".