665223300 has 288 divisors, whose sum is σ = 2488451840. Its totient is φ = 149299200.

The previous prime is 665223283. The next prime is 665223301. The reversal of 665223300 is 3322566.

665223300 is a `hidden beast` number, since 6 + 652 + 2 + 3 + 3 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (665223301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1152612 + ... + 1153188.

Almost surely, 2^665223300 is an apocalyptic number.

665223300 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 665223300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244225920).

665223300 is an abundant number, since it is smaller than the sum of its proper divisors (1823228540).

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

665223300 is a wasteful number, since it uses less digits than its factorization.

665223300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 665223300 is about 25791.9231543520. The cubic root of 665223300 is about 872.9495607424.

Adding to 665223300 its reverse (3322566), we get a palindrome (668545866).

The spelling of 665223300 in words is "six hundred sixty-five million, two hundred twenty-three thousand, three hundred".