66800006671 has 2 divisors, whose sum is σ = 66800006672. Its totient is φ = 66800006670.

The previous prime is 66800006659. The next prime is 66800006681. The reversal of 66800006671 is 17660000866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66800006671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66800006681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400003335 + 33400003336.

It is an arithmetic number, because the mean of its divisors is an integer number (33400003336).

Almost surely, 2^66800006671 is an apocalyptic number.

66800006671 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800006671 is an equidigital number, since it uses as much as digits as its factorization.

66800006671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 66800006671 in words is "sixty-six billion, eight hundred million, six thousand, six hundred seventy-one".