665636032 has 28 divisors (see below), whose sum is σ = 1326428640. Its totient is φ = 331417856.

The previous prime is 665636029. The next prime is 665636033. The reversal of 665636032 is 230636566.

It is a junction number, because it is equal to n+sod(n) for n = 665635982 and 665636000.

It is not an unprimeable number, because it can be changed into a prime (665636033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6463 + ... + 37054.

Almost surely, 2^665636032 is an apocalyptic number.

It is an amenable number.

665636032 is a deficient number, since it is larger than the sum of its proper divisors (660792608).

665636032 is a wasteful number, since it uses less digits than its factorization.

665636032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43768 (or 43758 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 37.

The square root of 665636032 is about 25799.9231006606. The cubic root of 665636032 is about 873.1300614003.

The spelling of 665636032 in words is "six hundred sixty-five million, six hundred thirty-six thousand, thirty-two".