665203320 has 128 divisors (see below), whose sum is σ = 2232576000. Its totient is φ = 176169600.

The previous prime is 665203313. The next prime is 665203327. The reversal of 665203320 is 23302566.

665203320 is a `hidden beast` number, since 6 + 652 + 0 + 3 + 3 + 2 + 0 = 666.

665203320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665203313) and next prime (665203327).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665203327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161041 + ... + 165119.

It is an arithmetic number, because the mean of its divisors is an integer number (17442000).

Almost surely, 2^665203320 is an apocalyptic number.

665203320 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 665203320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1116288000).

665203320 is an abundant number, since it is smaller than the sum of its proper divisors (1567372680).

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

665203320 is a wasteful number, since it uses less digits than its factorization.

665203320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250 (or 4240 counting only the distinct ones).

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

The square root of 665203320 is about 25791.5358208851. The cubic root of 665203320 is about 872.9408209669.

Adding to 665203320 its reverse (23302566), we get a palindrome (688505886).

The spelling of 665203320 in words is "six hundred sixty-five million, two hundred three thousand, three hundred twenty".