663641001 has 24 divisors (see below), whose sum is σ = 973215360. Its totient is φ = 435708000.

The previous prime is 663640997. The next prime is 663641093. The reversal of 663641001 is 100146366.

It is not a de Polignac number, because 663641001 - 2² = 663640997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663648001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 348151 + ... + 350051.

It is an arithmetic number, because the mean of its divisors is an integer number (40550640).

Almost surely, 2^663641001 is an apocalyptic number.

It is an amenable number.

663641001 is a deficient number, since it is larger than the sum of its proper divisors (309574359).

663641001 is a wasteful number, since it uses less digits than its factorization.

663641001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 663641001 is about 25761.2305800791. The cubic root of 663641001 is about 872.2568791388.

Adding to 663641001 its reverse (100146366), we get a palindrome (763787367).

The spelling of 663641001 in words is "six hundred sixty-three million, six hundred forty-one thousand, one".