668669505 has 32 divisors (see below), whose sum is σ = 1225836288. Its totient is φ = 304896000.

The previous prime is 668669471. The next prime is 668669543. The reversal of 668669505 is 505966866.

668669505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668669505 - 2⁷ = 668669377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34165 + ... + 50045.

It is an arithmetic number, because the mean of its divisors is an integer number (38307384).

Almost surely, 2^668669505 is an apocalyptic number.

It is an amenable number.

668669505 is a deficient number, since it is larger than the sum of its proper divisors (557166783).

668669505 is a wasteful number, since it uses less digits than its factorization.

668669505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16297.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The square root of 668669505 is about 25858.6446860620. The cubic root of 668669505 is about 874.4544103548.

The spelling of 668669505 in words is "six hundred sixty-eight million, six hundred sixty-nine thousand, five hundred five".