665302820 has 96 divisors (see below), whose sum is σ = 1820786688. Its totient is φ = 198162432.

The previous prime is 665302747. The next prime is 665302823. The reversal of 665302820 is 28203566.

It is not an unprimeable number, because it can be changed into a prime (665302823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20189 + ... + 41691.

It is an arithmetic number, because the mean of its divisors is an integer number (18966528).

Almost surely, 2^665302820 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 665302820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910393344).

665302820 is an abundant number, since it is smaller than the sum of its proper divisors (1155483868).

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

665302820 is a wasteful number, since it uses less digits than its factorization.

665302820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21549 (or 21547 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 665302820 is about 25793.4646761539. The cubic root of 665302820 is about 872.9843431396.

The spelling of 665302820 in words is "six hundred sixty-five million, three hundred two thousand, eight hundred twenty".