66993244 has 12 divisors (see below), whose sum is σ = 118447504. Its totient is φ = 33151104.

The previous prime is 66993239. The next prime is 66993247. The reversal of 66993244 is 44239966.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66993244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66993247) 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 3 ways as a sum of consecutive naturals, for example, 85944 + ... + 86719.

Almost surely, 2^66993244 is an apocalyptic number.

It is an amenable number.

66993244 is a deficient number, since it is larger than the sum of its proper divisors (51454260).

66993244 is a wasteful number, since it uses less digits than its factorization.

66993244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172764 (or 172762 counting only the distinct ones).

The product of its digits is 279936, while the sum is 43.

The square root of 66993244 is about 8184.9400730854. The cubic root of 66993244 is about 406.1411579345.

The spelling of 66993244 in words is "sixty-six million, nine hundred ninety-three thousand, two hundred forty-four".