4402645666 has 4 divisors (see below), whose sum is σ = 6603968502. Its totient is φ = 2201322832.

The previous prime is 4402645619. The next prime is 4402645673. The reversal of 4402645666 is 6665462044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4400332225 + 2313441 = 66335^2 + 1521^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1100661415 + ... + 1100661418.

Almost surely, 2^4402645666 is an apocalyptic number.

4402645666 is a deficient number, since it is larger than the sum of its proper divisors (2201322836).

4402645666 is a wasteful number, since it uses less digits than its factorization.

4402645666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201322835.

The product of its (nonzero) digits is 829440, while the sum is 43.

The square root of 4402645666 is about 66352.4352680442. The cubic root of 4402645666 is about 1638.9709072791.

The spelling of 4402645666 in words is "four billion, four hundred two million, six hundred forty-five thousand, six hundred sixty-six".