66667444 has 12 divisors (see below), whose sum is σ = 116817568. Its totient is φ = 33291000.

The previous prime is 66667441. The next prime is 66667457. The reversal of 66667444 is 44476666.

It is a self number, because there is not a number n which added to its sum of digits gives 66667444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66667441) 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, 7032 + ... + 13519.

Almost surely, 2^66667444 is an apocalyptic number.

It is an amenable number.

66667444 is a deficient number, since it is larger than the sum of its proper divisors (50150124).

66667444 is a wasteful number, since it uses less digits than its factorization.

66667444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21366 (or 21364 counting only the distinct ones).

The product of its digits is 580608, while the sum is 43.

The square root of 66667444 is about 8165.0134108892. The cubic root of 66667444 is about 405.4817089982.

The spelling of 66667444 in words is "sixty-six million, six hundred sixty-seven thousand, four hundred forty-four".