638135884753 has 2 divisors, whose sum is σ = 638135884754. Its totient is φ = 638135884752.

The previous prime is 638135884751. The next prime is 638135884801. The reversal of 638135884753 is 357488531836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603817581249 + 34318303504 = 777057^2 + 185252^2 .

It is a cyclic number.

It is not a de Polignac number, because 638135884753 - 2¹ = 638135884751 is a prime.

Together with 638135884751, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 638135884691 and 638135884700.

It is not a weakly prime, because it can be changed into another prime (638135884751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319067942376 + 319067942377.

It is an arithmetic number, because the mean of its divisors is an integer number (319067942377).

Almost surely, 2^638135884753 is an apocalyptic number.

It is an amenable number.

638135884753 is a deficient number, since it is larger than the sum of its proper divisors (1).

638135884753 is an equidigital number, since it uses as much as digits as its factorization.

638135884753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58060800, while the sum is 61.

The spelling of 638135884753 in words is "six hundred thirty-eight billion, one hundred thirty-five million, eight hundred eighty-four thousand, seven hundred fifty-three".