66766766 has 8 divisors (see below), whose sum is σ = 109254744. Its totient is φ = 30348520.

The previous prime is 66766747. The next prime is 66766783.

66766766 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517405 + ... + 1517448.

It is an arithmetic number, because the mean of its divisors is an integer number (13656843).

Almost surely, 2^66766766 is an apocalyptic number.

66766766 is a deficient number, since it is larger than the sum of its proper divisors (42487978).

66766766 is a wasteful number, since it uses less digits than its factorization.

66766766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034866.

The product of its digits is 2286144, while the sum is 50.

The square root of 66766766 is about 8171.0933172985. The cubic root of 66766766 is about 405.6829730063.

The spelling of 66766766 in words is "sixty-six million, seven hundred sixty-six thousand, seven hundred sixty-six".