66315679 has 2 divisors, whose sum is σ = 66315680. Its totient is φ = 66315678.

The previous prime is 66315677. The next prime is 66315707. The reversal of 66315679 is 97651366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66315679 - 2¹ = 66315677 is a prime.

Together with 66315677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66315671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33157839 + 33157840.

It is an arithmetic number, because the mean of its divisors is an integer number (33157840).

Almost surely, 2^66315679 is an apocalyptic number.

66315679 is a deficient number, since it is larger than the sum of its proper divisors (1).

66315679 is an equidigital number, since it uses as much as digits as its factorization.

66315679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 66315679 is about 8143.4439274793. The cubic root of 66315679 is about 404.7672879427.

The spelling of 66315679 in words is "sixty-six million, three hundred fifteen thousand, six hundred seventy-nine".