669652369 has 4 divisors (see below), whose sum is σ = 692743860. Its totient is φ = 646560880.

The previous prime is 669652367. The next prime is 669652387. The reversal of 669652369 is 963256966.

669652369 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.

It can be written as a sum of positive squares in 2 ways, for example, as 513702225 + 155950144 = 22665^2 + 12488^2 .

It is a cyclic number.

It is not a de Polignac number, because 669652369 - 2¹ = 669652367 is a prime.

It is a super-2 number, since 2×669652369² = 896868590614624322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669652367) 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, 11545702 + ... + 11545759.

It is an arithmetic number, because the mean of its divisors is an integer number (173185965).

Almost surely, 2^669652369 is an apocalyptic number.

It is an amenable number.

669652369 is a deficient number, since it is larger than the sum of its proper divisors (23091491).

669652369 is a wasteful number, since it uses less digits than its factorization.

669652369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23091490.

The product of its digits is 3149280, while the sum is 52.

The square root of 669652369 is about 25877.6422612262. The cubic root of 669652369 is about 874.8826483164.

The spelling of 669652369 in words is "six hundred sixty-nine million, six hundred fifty-two thousand, three hundred sixty-nine".