665336601 has 24 divisors (see below), whose sum is σ = 993424640. Its totient is φ = 428652000.

The previous prime is 665336597. The next prime is 665336603. The reversal of 665336601 is 106633566.

It is a happy number.

665336601 is a `hidden beast` number, since 66 + 533 + 6 + 60 + 1 = 666.

665336601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665336601 - 2² = 665336597 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665336603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292095 + ... + 294363.

Almost surely, 2^665336601 is an apocalyptic number.

It is an amenable number.

665336601 is a deficient number, since it is larger than the sum of its proper divisors (328088039).

665336601 is a wasteful number, since it uses less digits than its factorization.

665336601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357 (or 3354 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 665336601 is about 25794.1195042591. The cubic root of 665336601 is about 872.9991182586. Note that the first 3 decimals are identical.

The spelling of 665336601 in words is "six hundred sixty-five million, three hundred thirty-six thousand, six hundred one".