665791424320 has 448 divisors, whose sum is σ = 1820255846400. Its totient is φ = 229765939200.

The previous prime is 665791424299. The next prime is 665791424393. The reversal of 665791424320 is 23424197566.

It is a super-3 number, since 3×665791424320³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1482831456 + ... + 1482831904.

Almost surely, 2^665791424320 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 665791424320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910127923200).

665791424320 is an abundant number, since it is smaller than the sum of its proper divisors (1154464422080).

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

665791424320 is a wasteful number, since it uses less digits than its factorization.

665791424320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 665791424320 in words is "six hundred sixty-five billion, seven hundred ninety-one million, four hundred twenty-four thousand, three hundred twenty".