663210401 has 4 divisors (see below), whose sum is σ = 757954752. Its totient is φ = 568466052.

The previous prime is 663210397. The next prime is 663210403. The reversal of 663210401 is 104012366.

It is a happy number.

663210401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104012366 = 2 ⋅52006183.

It is not a de Polignac number, because 663210401 - 2² = 663210397 is a prime.

It is a super-3 number, since 3×663210401³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663210403) 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, 47372165 + ... + 47372178.

It is an arithmetic number, because the mean of its divisors is an integer number (189488688).

Almost surely, 2^663210401 is an apocalyptic number.

It is an amenable number.

663210401 is a deficient number, since it is larger than the sum of its proper divisors (94744351).

663210401 is an equidigital number, since it uses as much as digits as its factorization.

663210401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94744350.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 663210401 is about 25752.8717039479. The cubic root of 663210401 is about 872.0681852140.

Adding to 663210401 its reverse (104012366), we get a palindrome (767222767).

The spelling of 663210401 in words is "six hundred sixty-three million, two hundred ten thousand, four hundred one".