66684900330679 has 2 divisors, whose sum is σ = 66684900330680. Its totient is φ = 66684900330678.

The previous prime is 66684900330677. The next prime is 66684900330767. The reversal of 66684900330679 is 97603300948666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66684900330679 - 2¹ = 66684900330677 is a prime.

It is a super-2 number, since 2×66684900330679² (a number of 28 digits) contains 22 as substring.

Together with 66684900330677, 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 (66684900330677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33342450165339 + 33342450165340.

It is an arithmetic number, because the mean of its divisors is an integer number (33342450165340).

Almost surely, 2^{66684900330679} is an apocalyptic number.

66684900330679 is a deficient number, since it is larger than the sum of its proper divisors (1).

66684900330679 is an equidigital number, since it uses as much as digits as its factorization.

66684900330679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211631616, while the sum is 67.

The spelling of 66684900330679 in words is "sixty-six trillion, six hundred eighty-four billion, nine hundred million, three hundred thirty thousand, six hundred seventy-nine".