66639600679 has 2 divisors, whose sum is σ = 66639600680. Its totient is φ = 66639600678.

The previous prime is 66639600661. The next prime is 66639600701. The reversal of 66639600679 is 97600693666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66639600679 - 2¹¹ = 66639598631 is a prime.

It is a super-2 number, since 2×66639600679² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66639600779) 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, 33319800339 + 33319800340.

It is an arithmetic number, because the mean of its divisors is an integer number (33319800340).

Almost surely, 2^66639600679 is an apocalyptic number.

66639600679 is a deficient number, since it is larger than the sum of its proper divisors (1).

66639600679 is an equidigital number, since it uses as much as digits as its factorization.

66639600679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 58.

The spelling of 66639600679 in words is "sixty-six billion, six hundred thirty-nine million, six hundred thousand, six hundred seventy-nine".