66679843 has 2 divisors, whose sum is σ = 66679844. Its totient is φ = 66679842.

The previous prime is 66679813. The next prime is 66679849. The reversal of 66679843 is 34897666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66679843 - 2¹³ = 66671651 is a prime.

It is not a weakly prime, because it can be changed into another prime (66679849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33339921 + 33339922.

It is an arithmetic number, because the mean of its divisors is an integer number (33339922).

Almost surely, 2^66679843 is an apocalyptic number.

66679843 is a deficient number, since it is larger than the sum of its proper divisors (1).

66679843 is an equidigital number, since it uses as much as digits as its factorization.

66679843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 49.

The square root of 66679843 is about 8165.7726517458. The cubic root of 66679843 is about 405.5068449854.

The spelling of 66679843 in words is "sixty-six million, six hundred seventy-nine thousand, eight hundred forty-three".