66766677666766 has 192 divisors, whose sum is σ = 128716331627520. Its totient is φ = 25231533649920.

The previous prime is 66766677666763. The next prime is 66766677666791.

It is a happy number.

66766677666766 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×66766677666766³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766677666761) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 41392855776 + ... + 41392857388.

It is an arithmetic number, because the mean of its divisors is an integer number (670397560560).

Almost surely, 2^{66766677666766} is an apocalyptic number.

66766677666766 is a deficient number, since it is larger than the sum of its proper divisors (61949653960754).

66766677666766 is a wasteful number, since it uses less digits than its factorization.

66766677666766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771 (or 2718 counting only the distinct ones).

The product of its digits is 145179288576, while the sum is 88.

The spelling of 66766677666766 in words is "sixty-six trillion, seven hundred sixty-six billion, six hundred seventy-seven million, six hundred sixty-six thousand, seven hundred sixty-six".