638353648753 has 2 divisors, whose sum is σ = 638353648754. Its totient is φ = 638353648752.

The previous prime is 638353648739. The next prime is 638353648783. The reversal of 638353648753 is 357846353836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638196472384 + 157176369 = 798872^2 + 12537^2 .

It is a cyclic number.

It is not a de Polignac number, because 638353648753 - 2⁹ = 638353648241 is a prime.

It is a super-4 number, since 4×638353648753⁴ (a number of 48 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638353648691 and 638353648700.

It is not a weakly prime, because it can be changed into another prime (638353648703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319176824376 + 319176824377.

It is an arithmetic number, because the mean of its divisors is an integer number (319176824377).

Almost surely, 2^638353648753 is an apocalyptic number.

It is an amenable number.

638353648753 is a deficient number, since it is larger than the sum of its proper divisors (1).

638353648753 is an equidigital number, since it uses as much as digits as its factorization.

638353648753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130636800, while the sum is 61.

The spelling of 638353648753 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred forty-eight thousand, seven hundred fifty-three".