669325243129 has 3 divisors (see below), whose sum is σ = 669326061253. Its totient is φ = 669324425006.

The previous prime is 669325243123. The next prime is 669325243151. The reversal of 669325243129 is 921342523966.

The square root of 669325243129 is 818123.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 669325243129 - 2²¹ = 669323145977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669325243123) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 409062 + ... + 1227184.

Almost surely, 2^669325243129 is an apocalyptic number.

669325243129 is the 818123-rd square number.

669325243129 is the 409062-nd centered octagonal number.

It is an amenable number.

669325243129 is a deficient number, since it is larger than the sum of its proper divisors (818124).

669325243129 is an frugal number, since it uses more digits than its factorization.

669325243129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636246 (or 818123 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 52.

The spelling of 669325243129 in words is "six hundred sixty-nine billion, three hundred twenty-five million, two hundred forty-three thousand, one hundred twenty-nine".