66766677666763 has 2 divisors, whose sum is σ = 66766677666764. Its totient is φ = 66766677666762.

The previous prime is 66766677666761. The next prime is 66766677666791. The reversal of 66766677666763 is 36766677666766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66766677666763 - 2¹ = 66766677666761 is a prime.

It is a super-3 number, since 3×66766677666763³ (a number of 42 digits) contains 333 as substring.

Together with 66766677666761, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66766677666761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383338833381 + 33383338833382.

It is an arithmetic number, because the mean of its divisors is an integer number (33383338833382).

Almost surely, 2^{66766677666763} is an apocalyptic number.

66766677666763 is a deficient number, since it is larger than the sum of its proper divisors (1).

66766677666763 is an equidigital number, since it uses as much as digits as its factorization.

66766677666763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72589644288, while the sum is 85.

The spelling of 66766677666763 in words is "sixty-six trillion, seven hundred sixty-six billion, six hundred seventy-seven million, six hundred sixty-six thousand, seven hundred sixty-three".