66143233 has 8 divisors (see below), whose sum is σ = 71966888. Its totient is φ = 60424704.

The previous prime is 66143221. The next prime is 66143257. The reversal of 66143233 is 33234166.

It can be written as a sum of positive squares in 4 ways, for example, as 986049 + 65157184 = 993^2 + 8072^2 .

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-66143233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66143333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24966 + ... + 27487.

It is an arithmetic number, because the mean of its divisors is an integer number (8995861).

Almost surely, 2^66143233 is an apocalyptic number.

It is an amenable number.

66143233 is a deficient number, since it is larger than the sum of its proper divisors (5823655).

66143233 is a wasteful number, since it uses less digits than its factorization.

66143233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52563.

The product of its digits is 7776, while the sum is 28.

The square root of 66143233 is about 8132.8490088037. The cubic root of 66143233 is about 404.4161337312.

Adding to 66143233 its reverse (33234166), we get a palindrome (99377399).

The spelling of 66143233 in words is "sixty-six million, one hundred forty-three thousand, two hundred thirty-three".