66766767 has 16 divisors (see below), whose sum is σ = 90865152. Its totient is φ = 43598240.

The previous prime is 66766747. The next prime is 66766783. The reversal of 66766767 is 76766766.

It is a cyclic number.

It is not a de Polignac number, because 66766767 - 2¹² = 66762671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34633 + ... + 36509.

It is an arithmetic number, because the mean of its divisors is an integer number (5679072).

Almost surely, 2^66766767 is an apocalyptic number.

66766767 is a deficient number, since it is larger than the sum of its proper divisors (24098385).

66766767 is a wasteful number, since it uses less digits than its factorization.

66766767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118.

The product of its digits is 2667168, while the sum is 51.

The square root of 66766767 is about 8171.0933784898. The cubic root of 66766767 is about 405.6829750317.

Subtracting 66766767 from its reverse (76766766), we obtain a palindrome (9999999).

The spelling of 66766767 in words is "sixty-six million, seven hundred sixty-six thousand, seven hundred sixty-seven".