66966841 has 2 divisors, whose sum is σ = 66966842. Its totient is φ = 66966840.

The previous prime is 66966821. The next prime is 66966847. The reversal of 66966841 is 14866966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48511225 + 18455616 = 6965^2 + 4296^2 .

It is a cyclic number.

It is not a de Polignac number, because 66966841 - 2⁹ = 66966329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66966791 and 66966800.

It is not a weakly prime, because it can be changed into another prime (66966847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33483420 + 33483421.

It is an arithmetic number, because the mean of its divisors is an integer number (33483421).

Almost surely, 2^66966841 is an apocalyptic number.

It is an amenable number.

66966841 is a deficient number, since it is larger than the sum of its proper divisors (1).

66966841 is an equidigital number, since it uses as much as digits as its factorization.

66966841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 46.

The square root of 66966841 is about 8183.3270128964. The cubic root of 66966841 is about 406.0877955683.

The spelling of 66966841 in words is "sixty-six million, nine hundred sixty-six thousand, eight hundred forty-one".