66396843 has 12 divisors (see below), whose sum is σ = 96134688. Its totient is φ = 44159280.

The previous prime is 66396797. The next prime is 66396851. The reversal of 66396843 is 34869366.

66396843 is a `hidden beast` number, since 6 + 639 + 6 + 8 + 4 + 3 = 666.

It is not a de Polignac number, because 66396843 - 2¹² = 66392747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66396443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4680 + ... + 12437.

It is an arithmetic number, because the mean of its divisors is an integer number (8011224).

Almost surely, 2^66396843 is an apocalyptic number.

66396843 is a deficient number, since it is larger than the sum of its proper divisors (29737845).

66396843 is a wasteful number, since it uses less digits than its factorization.

66396843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17554 (or 17551 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 66396843 is about 8148.4257988890. The cubic root of 66396843 is about 404.9323526704.

The spelling of 66396843 in words is "sixty-six million, three hundred ninety-six thousand, eight hundred forty-three".