669666338 has 16 divisors (see below), whose sum is σ = 1096740000. Its totient is φ = 304137600.

The previous prime is 669666313. The next prime is 669666341. The reversal of 669666338 is 833666966.

It is a self number, because there is not a number n which added to its sum of digits gives 669666338.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15293 + ... + 39663.

It is an arithmetic number, because the mean of its divisors is an integer number (68546250).

Almost surely, 2^669666338 is an apocalyptic number.

669666338 is a deficient number, since it is larger than the sum of its proper divisors (427073662).

669666338 is a wasteful number, since it uses less digits than its factorization.

669666338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25633.

The product of its digits is 5038848, while the sum is 53.

The square root of 669666338 is about 25877.9121646241. The cubic root of 669666338 is about 874.8887316472. Note that the first 3 decimals are identical.

The spelling of 669666338 in words is "six hundred sixty-nine million, six hundred sixty-six thousand, three hundred thirty-eight".