66143765 has 8 divisors (see below), whose sum is σ = 79435680. Its totient is φ = 52872912.

The previous prime is 66143741. The next prime is 66143797. The reversal of 66143765 is 56734166.

It is a happy number.

66143765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66143765 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2762 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (9929460).

Almost surely, 2^66143765 is an apocalyptic number.

It is an amenable number.

66143765 is a deficient number, since it is larger than the sum of its proper divisors (13291915).

66143765 is a wasteful number, since it uses less digits than its factorization.

66143765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10531.

The product of its digits is 90720, while the sum is 38.

The square root of 66143765 is about 8132.8817156036. The cubic root of 66143765 is about 404.4172179882.

The spelling of 66143765 in words is "sixty-six million, one hundred forty-three thousand, seven hundred sixty-five".