665233251504 has 120 divisors (see below), whose sum is σ = 1826939110080. Its totient is φ = 208507913856.

The previous prime is 665233251457. The next prime is 665233251521. The reversal of 665233251504 is 405152332566.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1276107 + ... + 1720149.

It is an arithmetic number, because the mean of its divisors is an integer number (15224492584).

Almost surely, 2^665233251504 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 665233251504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913469555040).

665233251504 is an abundant number, since it is smaller than the sum of its proper divisors (1161705858576).

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

665233251504 is a wasteful number, since it uses less digits than its factorization.

665233251504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444159 (or 444130 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 665233251504 in words is "six hundred sixty-five billion, two hundred thirty-three million, two hundred fifty-one thousand, five hundred four".