669000000 has 196 divisors, whose sum is σ = 2222471552. Its totient is φ = 177600000.

The previous prime is 668999999. The next prime is 669000001. The reversal of 669000000 is 966.

It is an interprime number because it is at equal distance from previous prime (668999999) and next prime (669000001).

It is a super-2 number, since 2×669000000² = 895122000000000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669000001) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2999889 + ... + 3000111.

Almost surely, 2^669000000 is an apocalyptic number.

669000000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1111235776).

669000000 is an abundant number, since it is smaller than the sum of its proper divisors (1553471552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669000000 is an frugal number, since it uses more digits than its factorization.

669000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 669000000 is about 25865.0343127551. The cubic root of 669000000 is about 874.5984552117.

Adding to 669000000 its reverse (966), we get a palindrome (669000966).

The spelling of 669000000 in words is "six hundred sixty-nine million", and thus it is an aban number.