1666006444 has 12 divisors (see below), whose sum is σ = 2917876864. Its totient is φ = 832327344.

The previous prime is 1666006429. The next prime is 1666006451. The reversal of 1666006444 is 4446006661.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 163404 + ... + 173299.

Almost surely, 2^1666006444 is an apocalyptic number.

It is an amenable number.

1666006444 is a deficient number, since it is larger than the sum of its proper divisors (1251870420).

1666006444 is a wasteful number, since it uses less digits than its factorization.

1666006444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337944 (or 337942 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 1666006444 is about 40816.7422021895. The cubic root of 1666006444 is about 1185.4745247143.

The spelling of 1666006444 in words is "one billion, six hundred sixty-six million, six thousand, four hundred forty-four".