66766143 has 16 divisors (see below), whose sum is σ = 91414400. Its totient is φ = 43321824.

The previous prime is 66766129. The next prime is 66766159. The reversal of 66766143 is 34166766.

It is a happy number.

It is not a de Polignac number, because 66766143 - 2⁴ = 66766127 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 (66766043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44280 + ... + 45762.

It is an arithmetic number, because the mean of its divisors is an integer number (5713400).

Almost surely, 2^66766143 is an apocalyptic number.

66766143 is a deficient number, since it is larger than the sum of its proper divisors (24648257).

66766143 is a wasteful number, since it uses less digits than its factorization.

66766143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its digits is 108864, while the sum is 39.

The square root of 66766143 is about 8171.0551950161. The cubic root of 66766143 is about 405.6817111945.

The spelling of 66766143 in words is "sixty-six million, seven hundred sixty-six thousand, one hundred forty-three".