638632733023 has 2 divisors, whose sum is σ = 638632733024. Its totient is φ = 638632733022.

The previous prime is 638632733009. The next prime is 638632733047. The reversal of 638632733023 is 320337236836.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638632733023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638632733003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319316366511 + 319316366512.

It is an arithmetic number, because the mean of its divisors is an integer number (319316366512).

Almost surely, 2^638632733023 is an apocalyptic number.

638632733023 is a deficient number, since it is larger than the sum of its proper divisors (1).

638632733023 is an equidigital number, since it uses as much as digits as its factorization.

638632733023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 46.

Adding to 638632733023 its reverse (320337236836), we get a palindrome (958969969859).

The spelling of 638632733023 in words is "six hundred thirty-eight billion, six hundred thirty-two million, seven hundred thirty-three thousand, twenty-three".