66459643 has 4 divisors (see below), whose sum is σ = 66511800. Its totient is φ = 66407488.

The previous prime is 66459641. The next prime is 66459697. The reversal of 66459643 is 34695466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66459643 - 2¹ = 66459641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66459643.

It is not an unprimeable number, because it can be changed into a prime (66459641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24118 + ... + 26731.

It is an arithmetic number, because the mean of its divisors is an integer number (16627950).

Almost surely, 2^66459643 is an apocalyptic number.

66459643 is a deficient number, since it is larger than the sum of its proper divisors (52157).

66459643 is a wasteful number, since it uses less digits than its factorization.

66459643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52156.

The product of its digits is 466560, while the sum is 43.

The square root of 66459643 is about 8152.2783931856. The cubic root of 66459643 is about 405.0599779078.

The spelling of 66459643 in words is "sixty-six million, four hundred fifty-nine thousand, six hundred forty-three".