66824493 has 8 divisors (see below), whose sum is σ = 90100800. Its totient is φ = 44048928.

The previous prime is 66824491. The next prime is 66824503. The reversal of 66824493 is 39442866.

It is a happy number.

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

It is not a de Polignac number, because 66824493 - 2¹ = 66824491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66824491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124873 + ... + 125406.

It is an arithmetic number, because the mean of its divisors is an integer number (11262600).

Almost surely, 2^66824493 is an apocalyptic number.

It is an amenable number.

66824493 is a deficient number, since it is larger than the sum of its proper divisors (23276307).

66824493 is a wasteful number, since it uses less digits than its factorization.

66824493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250371.

The product of its digits is 248832, while the sum is 42.

The square root of 66824493 is about 8174.6249455250. The cubic root of 66824493 is about 405.7998580788.

It can be divided in two parts, 6682 and 4493, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 66824493 in words is "sixty-six million, eight hundred twenty-four thousand, four hundred ninety-three".