669845872 has 20 divisors (see below), whose sum is σ = 1304556880. Its totient is φ = 333186048.

The previous prime is 669845863. The next prime is 669845881. The reversal of 669845872 is 278548966.

669845872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (669845863) and next prime (669845881).

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, 105372 + ... + 111547.

It is an arithmetic number, because the mean of its divisors is an integer number (65227844).

Almost surely, 2^669845872 is an apocalyptic number.

It is an amenable number.

669845872 is a deficient number, since it is larger than the sum of its proper divisors (634711008).

669845872 is a wasteful number, since it uses less digits than its factorization.

669845872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217120 (or 217114 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The square root of 669845872 is about 25881.3807977859. The cubic root of 669845872 is about 874.9669090071.

The spelling of 669845872 in words is "six hundred sixty-nine million, eight hundred forty-five thousand, eight hundred seventy-two".