663633431 has 2 divisors, whose sum is σ = 663633432. Its totient is φ = 663633430.

The previous prime is 663633413. The next prime is 663633449. The reversal of 663633431 is 134336366.

Together with previous prime (663633413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (663633413) and next prime (663633449).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663633431 is a prime.

It is a super-4 number, since 4×663633431⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 663633391 and 663633400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663636431) 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 as a sum of consecutive naturals, namely, 331816715 + 331816716.

It is an arithmetic number, because the mean of its divisors is an integer number (331816716).

Almost surely, 2^663633431 is an apocalyptic number.

663633431 is a deficient number, since it is larger than the sum of its proper divisors (1).

663633431 is an equidigital number, since it uses as much as digits as its factorization.

663633431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 35.

The square root of 663633431 is about 25761.0836534491. The cubic root of 663633431 is about 872.2535625818.

Adding to 663633431 its reverse (134336366), we get a palindrome (797969797).

The spelling of 663633431 in words is "six hundred sixty-three million, six hundred thirty-three thousand, four hundred thirty-one".