66766711 has 12 divisors (see below), whose sum is σ = 73601136. Its totient is φ = 60521120.

The previous prime is 66766709. The next prime is 66766717. The reversal of 66766711 is 11766766.

It is not a de Polignac number, because 66766711 - 2¹ = 66766709 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 60315 + ... + 61411.

It is an arithmetic number, because the mean of its divisors is an integer number (6133428).

Almost surely, 2^66766711 is an apocalyptic number.

66766711 is a deficient number, since it is larger than the sum of its proper divisors (6834425).

66766711 is a wasteful number, since it uses less digits than its factorization.

66766711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622 (or 1611 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 66766711 is about 8171.0899517751. The cubic root of 66766711 is about 405.6828616107.

Subtracting from 66766711 its reverse (11766766), we obtain a palindrome (54999945).

The spelling of 66766711 in words is "sixty-six million, seven hundred sixty-six thousand, seven hundred eleven".