665985250 has 32 divisors (see below), whose sum is σ = 1424831616. Its totient is φ = 228337200.

The previous prime is 665985239. The next prime is 665985269. The reversal of 665985250 is 52589566.

It is a self number, because there is not a number n which added to its sum of digits gives 665985250.

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 15 ways as a sum of consecutive naturals, for example, 188532 + ... + 192031.

It is an arithmetic number, because the mean of its divisors is an integer number (44525988).

Almost surely, 2^665985250 is an apocalyptic number.

665985250 is an abundant number, since it is smaller than the sum of its proper divisors (758846366).

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

665985250 is a wasteful number, since it uses less digits than its factorization.

665985250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380587 (or 380577 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The square root of 665985250 is about 25806.6900241003. The cubic root of 665985250 is about 873.2827271274.

The spelling of 665985250 in words is "six hundred sixty-five million, nine hundred eighty-five thousand, two hundred fifty".