66878341 has 2 divisors, whose sum is σ = 66878342. Its totient is φ = 66878340.

The previous prime is 66878333. The next prime is 66878359. The reversal of 66878341 is 14387866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66487716 + 390625 = 8154^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 66878341 - 2³ = 66878333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66873341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33439170 + 33439171.

It is an arithmetic number, because the mean of its divisors is an integer number (33439171).

Almost surely, 2^66878341 is an apocalyptic number.

It is an amenable number.

66878341 is a deficient number, since it is larger than the sum of its proper divisors (1).

66878341 is an equidigital number, since it uses as much as digits as its factorization.

66878341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 66878341 is about 8177.9178890473. The cubic root of 66878341 is about 405.9088283231.

The spelling of 66878341 in words is "sixty-six million, eight hundred seventy-eight thousand, three hundred forty-one".