665720336 has 20 divisors (see below), whose sum is σ = 1290323664. Its totient is φ = 332733600.

The previous prime is 665720299. The next prime is 665720359. The reversal of 665720336 is 633027566.

It is a self number, because there is not a number n which added to its sum of digits gives 665720336.

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, 47051 + ... + 59541.

Almost surely, 2^665720336 is an apocalyptic number.

It is an amenable number.

665720336 is a deficient number, since it is larger than the sum of its proper divisors (624603328).

665720336 is a wasteful number, since it uses less digits than its factorization.

665720336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15830 (or 15824 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 665720336 is about 25801.5568522522. The cubic root of 665720336 is about 873.1669210082.

The spelling of 665720336 in words is "six hundred sixty-five million, seven hundred twenty thousand, three hundred thirty-six".