66416443 has 4 divisors (see below), whose sum is σ = 68211520. Its totient is φ = 64621368.

The previous prime is 66416431. The next prime is 66416447. The reversal of 66416443 is 34461466.

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 66416443 - 2⁹ = 66415931 is a prime.

It is a super-2 number, since 2×66416443² = 8822287801544498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66416399 and 66416408.

It is not an unprimeable number, because it can be changed into a prime (66416447) 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, 897483 + ... + 897556.

It is an arithmetic number, because the mean of its divisors is an integer number (17052880).

Almost surely, 2^66416443 is an apocalyptic number.

66416443 is a deficient number, since it is larger than the sum of its proper divisors (1795077).

66416443 is a wasteful number, since it uses less digits than its factorization.

66416443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795076.

The product of its digits is 41472, while the sum is 34.

The square root of 66416443 is about 8149.6283964362. The cubic root of 66416443 is about 404.9721933863.

The spelling of 66416443 in words is "sixty-six million, four hundred sixteen thousand, four hundred forty-three".