6661199444 has 12 divisors (see below), whose sum is σ = 11658092544. Its totient is φ = 3330315864.

The previous prime is 6661199443. The next prime is 6661199473. The reversal of 6661199444 is 4449911666.

It is a happy number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6661199392 and 6661199401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661199443) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12884 + ... + 116139.

It is an arithmetic number, because the mean of its divisors is an integer number (971507712).

Almost surely, 2^6661199444 is an apocalyptic number.

It is an amenable number.

6661199444 is a deficient number, since it is larger than the sum of its proper divisors (4996893100).

6661199444 is a wasteful number, since it uses less digits than its factorization.

6661199444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141934 (or 141932 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 6661199444 is about 81616.1714612980. The cubic root of 6661199444 is about 1881.5574317069.

The spelling of 6661199444 in words is "six billion, six hundred sixty-one million, one hundred ninety-nine thousand, four hundred forty-four".