669321291 has 8 divisors (see below), whose sum is σ = 895901904. Its totient is φ = 444477440.

The previous prime is 669321287. The next prime is 669321293. The reversal of 669321291 is 192123966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669321291 - 2² = 669321287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669321293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433290 + ... + 434831.

It is an arithmetic number, because the mean of its divisors is an integer number (111987738).

Almost surely, 2^669321291 is an apocalyptic number.

669321291 is a deficient number, since it is larger than the sum of its proper divisors (226580613).

669321291 is a wasteful number, since it uses less digits than its factorization.

669321291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868381.

The product of its digits is 34992, while the sum is 39.

The square root of 669321291 is about 25871.2444810836. The cubic root of 669321291 is about 874.7384430743.

The spelling of 669321291 in words is "six hundred sixty-nine million, three hundred twenty-one thousand, two hundred ninety-one".