665642825606 has 32 divisors (see below), whose sum is σ = 1119059956512. Its totient is φ = 294285519360.

The previous prime is 665642825599. The next prime is 665642825621. The reversal of 665642825606 is 606528246566.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2234270 + ... + 2514606.

It is an arithmetic number, because the mean of its divisors is an integer number (34970623641).

Almost surely, 2^665642825606 is an apocalyptic number.

665642825606 is a deficient number, since it is larger than the sum of its proper divisors (453417130906).

665642825606 is a wasteful number, since it uses less digits than its factorization.

665642825606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283304.

The product of its (nonzero) digits is 24883200, while the sum is 56.

The spelling of 665642825606 in words is "six hundred sixty-five billion, six hundred forty-two million, eight hundred twenty-five thousand, six hundred six".