66615079 has 2 divisors, whose sum is σ = 66615080. Its totient is φ = 66615078.

The previous prime is 66615077. The next prime is 66615137. The reversal of 66615079 is 97051666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66615079 - 2¹ = 66615077 is a prime.

Together with 66615077, 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 (66615077) 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, 33307539 + 33307540.

It is an arithmetic number, because the mean of its divisors is an integer number (33307540).

Almost surely, 2^66615079 is an apocalyptic number.

66615079 is a deficient number, since it is larger than the sum of its proper divisors (1).

66615079 is an equidigital number, since it uses as much as digits as its factorization.

66615079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 66615079 is about 8161.8061113947. The cubic root of 66615079 is about 405.3755171794.

The spelling of 66615079 in words is "sixty-six million, six hundred fifteen thousand, seventy-nine".