66143683 has 2 divisors, whose sum is σ = 66143684. Its totient is φ = 66143682.

The previous prime is 66143681. The next prime is 66143713. The reversal of 66143683 is 38634166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66143683 - 2¹ = 66143681 is a prime.

Together with 66143681, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66143681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33071841 + 33071842.

It is an arithmetic number, because the mean of its divisors is an integer number (33071842).

Almost surely, 2^66143683 is an apocalyptic number.

66143683 is a deficient number, since it is larger than the sum of its proper divisors (1).

66143683 is an equidigital number, since it uses as much as digits as its factorization.

66143683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 66143683 is about 8132.8766743385. The cubic root of 66143683 is about 404.4170508663.

It can be divided in two parts, 661 and 43683, that added together give a palindrome (44344).

The spelling of 66143683 in words is "sixty-six million, one hundred forty-three thousand, six hundred eighty-three".