708221666 has 12 divisors (see below), whose sum is σ = 1128499458. Its totient is φ = 333280512.

The previous prime is 708221641. The next prime is 708221671. The reversal of 708221666 is 666122807.

It is a happy number.

708221666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 565060441 + 143161225 = 23771^2 + 11965^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 612071 + ... + 613226.

Almost surely, 2^708221666 is an apocalyptic number.

708221666 is a deficient number, since it is larger than the sum of its proper divisors (420277792).

708221666 is a wasteful number, since it uses less digits than its factorization.

708221666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225333 (or 1225316 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 708221666 is about 26612.4344245317. The cubic root of 708221666 is about 891.3666945575.

The spelling of 708221666 in words is "seven hundred eight million, two hundred twenty-one thousand, six hundred sixty-six".