668753556 has 12 divisors (see below), whose sum is σ = 1560424992. Its totient is φ = 222917848.

The previous prime is 668753537. The next prime is 668753573. The reversal of 668753556 is 655357866.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 668753499 and 668753508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27864720 + ... + 27864743.

It is an arithmetic number, because the mean of its divisors is an integer number (130035416).

Almost surely, 2^668753556 is an apocalyptic number.

It is an amenable number.

668753556 is an abundant number, since it is smaller than the sum of its proper divisors (891671436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668753556 is a wasteful number, since it uses less digits than its factorization.

668753556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55729470 (or 55729468 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 51.

The square root of 668753556 is about 25860.2698361792. The cubic root of 668753556 is about 874.4910481297.

The spelling of 668753556 in words is "six hundred sixty-eight million, seven hundred fifty-three thousand, five hundred fifty-six".