665344001 has 6 divisors (see below), whose sum is σ = 773971650. Its totient is φ = 570294816.

The previous prime is 665343971. The next prime is 665344007. The reversal of 665344001 is 100443566.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 555827776 + 109516225 = 23576^2 + 10465^2 .

It is a de Polignac number, because none of the positive numbers 2^k-665344001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665344007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6789176 + ... + 6789273.

It is an arithmetic number, because the mean of its divisors is an integer number (128995275).

Almost surely, 2^665344001 is an apocalyptic number.

It is an amenable number.

665344001 is a deficient number, since it is larger than the sum of its proper divisors (108627649).

665344001 is a wasteful number, since it uses less digits than its factorization.

665344001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13578463 (or 13578456 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 665344001 is about 25794.2629474075. The cubic root of 665344001 is about 873.0023548006.

Adding to 665344001 its reverse (100443566), we get a palindrome (765787567).

The spelling of 665344001 in words is "six hundred sixty-five million, three hundred forty-four thousand, one".