66842644 has 24 divisors (see below), whose sum is σ = 127921248. Its totient is φ = 30308640.

The previous prime is 66842621. The next prime is 66842653. The reversal of 66842644 is 44624866.

It is a junction number, because it is equal to n+sod(n) for n = 66842597 and 66842606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18922 + ... + 22174.

It is an arithmetic number, because the mean of its divisors is an integer number (5330052).

Almost surely, 2^66842644 is an apocalyptic number.

It is an amenable number.

66842644 is a deficient number, since it is larger than the sum of its proper divisors (61078604).

66842644 is a wasteful number, since it uses less digits than its factorization.

66842644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735 (or 3733 counting only the distinct ones).

The product of its digits is 221184, while the sum is 40.

The square root of 66842644 is about 8175.7350739857. The cubic root of 66842644 is about 405.8365961375.

The spelling of 66842644 in words is "sixty-six million, eight hundred forty-two thousand, six hundred forty-four".