663402401 has 8 divisors (see below), whose sum is σ = 671153664. Its totient is φ = 655696080.

The previous prime is 663402391. The next prime is 663402403. The reversal of 663402401 is 104204366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663402401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663402403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18926 + ... + 41048.

It is an arithmetic number, because the mean of its divisors is an integer number (83894208).

Almost surely, 2^663402401 is an apocalyptic number.

It is an amenable number.

663402401 is a deficient number, since it is larger than the sum of its proper divisors (7751263).

663402401 is a wasteful number, since it uses less digits than its factorization.

663402401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22471.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 663402401 is about 25756.5991738040. The cubic root of 663402401 is about 872.1523319323.

Adding to 663402401 its reverse (104204366), we get a palindrome (767606767).

The spelling of 663402401 in words is "six hundred sixty-three million, four hundred two thousand, four hundred one".