66309679 has 2 divisors, whose sum is σ = 66309680. Its totient is φ = 66309678.

The previous prime is 66309671. The next prime is 66309697. The reversal of 66309679 is 97690366.

Together with next prime (66309697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66309679 - 2³ = 66309671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66309671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33154839 + 33154840.

It is an arithmetic number, because the mean of its divisors is an integer number (33154840).

Almost surely, 2^66309679 is an apocalyptic number.

66309679 is a deficient number, since it is larger than the sum of its proper divisors (1).

66309679 is an equidigital number, since it uses as much as digits as its factorization.

66309679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 46.

The square root of 66309679 is about 8143.0755246406. The cubic root of 66309679 is about 404.7550802868.

The spelling of 66309679 in words is "sixty-six million, three hundred nine thousand, six hundred seventy-nine".