66343841 has 2 divisors, whose sum is σ = 66343842. Its totient is φ = 66343840.

The previous prime is 66343811. The next prime is 66343847. The reversal of 66343841 is 14834366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 28398241 = 6160^2 + 5329^2 .

It is a cyclic number.

It is not a de Polignac number, because 66343841 - 2⁶ = 66343777 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66343847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33171920 + 33171921.

It is an arithmetic number, because the mean of its divisors is an integer number (33171921).

Almost surely, 2^66343841 is an apocalyptic number.

It is an amenable number.

66343841 is a deficient number, since it is larger than the sum of its proper divisors (1).

66343841 is an equidigital number, since it uses as much as digits as its factorization.

66343841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The square root of 66343841 is about 8145.1728649550. The cubic root of 66343841 is about 404.8245767735.

The spelling of 66343841 in words is "sixty-six million, three hundred forty-three thousand, eight hundred forty-one".