66217444 has 12 divisors (see below), whose sum is σ = 116260144. Its totient is φ = 33000264.

The previous prime is 66217429. The next prime is 66217447. The reversal of 66217444 is 44471266.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66217447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25734 + ... + 28189.

Almost surely, 2^66217444 is an apocalyptic number.

It is an amenable number.

66217444 is a deficient number, since it is larger than the sum of its proper divisors (50042700).

66217444 is a wasteful number, since it uses less digits than its factorization.

66217444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54234 (or 54232 counting only the distinct ones).

The product of its digits is 32256, while the sum is 34.

The square root of 66217444 is about 8137.4101531138. The cubic root of 66217444 is about 404.5673253550.

The spelling of 66217444 in words is "sixty-six million, two hundred seventeen thousand, four hundred forty-four".