665127320 has 192 divisors, whose sum is σ = 1831727520. Its totient is φ = 216057600.

The previous prime is 665127313. The next prime is 665127373. The reversal of 665127320 is 23721566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21455705 + ... + 21455735.

Almost surely, 2^665127320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665127320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (915863760).

665127320 is an abundant number, since it is smaller than the sum of its proper divisors (1166600200).

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

665127320 is a wasteful number, since it uses less digits than its factorization.

665127320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 665127320 is about 25790.0624272218. The cubic root of 665127320 is about 872.9075749767.

Adding to 665127320 its reverse (23721566), we get a palindrome (688848886).

It can be divided in two parts, 66 and 5127320, that multiplied together give a triangular number (338403120 = T₂₆₀₁₅).

The spelling of 665127320 in words is "six hundred sixty-five million, one hundred twenty-seven thousand, three hundred twenty".