661673308 has 12 divisors (see below), whose sum is σ = 1168176240. Its totient is φ = 327908672.

The previous prime is 661673291. The next prime is 661673317. The reversal of 661673308 is 803376166.

661673308 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731488 + ... + 732391.

It is an arithmetic number, because the mean of its divisors is an integer number (97348020).

Almost surely, 2^661673308 is an apocalyptic number.

It is an amenable number.

661673308 is a deficient number, since it is larger than the sum of its proper divisors (506502932).

661673308 is a wasteful number, since it uses less digits than its factorization.

661673308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463996 (or 1463994 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 661673308 is about 25723.0112545168. The cubic root of 661673308 is about 871.3939462881.

The spelling of 661673308 in words is "six hundred sixty-one million, six hundred seventy-three thousand, three hundred eight".