669233221 has 4 divisors (see below), whose sum is σ = 672033600. Its totient is φ = 666432844.

The previous prime is 669233197. The next prime is 669233263. The reversal of 669233221 is 122332966.

669233221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669233221 - 2⁵ = 669233189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669233021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399831 + ... + 1400308.

It is an arithmetic number, because the mean of its divisors is an integer number (168008400).

Almost surely, 2^669233221 is an apocalyptic number.

It is an amenable number.

669233221 is a deficient number, since it is larger than the sum of its proper divisors (2800379).

669233221 is a wasteful number, since it uses less digits than its factorization.

669233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800378.

The product of its digits is 23328, while the sum is 34.

The square root of 669233221 is about 25869.5423422990. The cubic root of 669233221 is about 874.7000750564.

The spelling of 669233221 in words is "six hundred sixty-nine million, two hundred thirty-three thousand, two hundred twenty-one".