665305616 has 20 divisors (see below), whose sum is σ = 1303515900. Its totient is φ = 328914432.

The previous prime is 665305607. The next prime is 665305649. The reversal of 665305616 is 616503566.

It can be written as a sum of positive squares in 2 ways, for example, as 361152016 + 304153600 = 19004^2 + 17440^2 .

It is a super-2 number, since 2×665305616² = 885263125362278912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665305616.

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 3 ways as a sum of consecutive naturals, for example, 232181 + ... + 235028.

It is an arithmetic number, because the mean of its divisors is an integer number (65175795).

Almost surely, 2^665305616 is an apocalyptic number.

It is an amenable number.

665305616 is a deficient number, since it is larger than the sum of its proper divisors (638210284).

665305616 is a wasteful number, since it uses less digits than its factorization.

665305616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467306 (or 467300 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 665305616 is about 25793.5188758727. The cubic root of 665305616 is about 872.9855660719.

The spelling of 665305616 in words is "six hundred sixty-five million, three hundred five thousand, six hundred sixteen".