66766916655 has 128 divisors (see below), whose sum is σ = 129352704000. Its totient is φ = 32550958080.

The previous prime is 66766916647. The next prime is 66766916669. The reversal of 66766916655 is 55661966766.

It is a happy number.

It is not a de Polignac number, because 66766916655 - 2³ = 66766916647 is a prime.

Its product of digits (73483200) is a multiple of the sum of its prime divisors (2520).

It is a junction number, because it is equal to n+sod(n) for n = 66766916592 and 66766916601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32520609 + ... + 32522661.

It is an arithmetic number, because the mean of its divisors is an integer number (1010568000).

Almost surely, 2^66766916655 is an apocalyptic number.

66766916655 is a deficient number, since it is larger than the sum of its proper divisors (62585787345).

66766916655 is a wasteful number, since it uses less digits than its factorization.

66766916655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526 (or 2520 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 63.

The spelling of 66766916655 in words is "sixty-six billion, seven hundred sixty-six million, nine hundred sixteen thousand, six hundred fifty-five".