67666066669 has 2 divisors, whose sum is σ = 67666066670. Its totient is φ = 67666066668.

The previous prime is 67666066619. The next prime is 67666066717. The reversal of 67666066669 is 96666066676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46229300100 + 21436766569 = 215010^2 + 146413^2 .

It is a cyclic number.

It is not a de Polignac number, because 67666066669 - 2²⁵ = 67632512237 is a prime.

It is a super-2 number, since 2×67666066669² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67666066669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67666066619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33833033334 + 33833033335.

It is an arithmetic number, because the mean of its divisors is an integer number (33833033335).

Almost surely, 2^67666066669 is an apocalyptic number.

It is an amenable number.

67666066669 is a deficient number, since it is larger than the sum of its proper divisors (1).

67666066669 is an equidigital number, since it uses as much as digits as its factorization.

67666066669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105815808, while the sum is 64.

The spelling of 67666066669 in words is "sixty-seven billion, six hundred sixty-six million, sixty-six thousand, six hundred sixty-nine".