638378455259 has 2 divisors, whose sum is σ = 638378455260. Its totient is φ = 638378455258.

The previous prime is 638378455217. The next prime is 638378455289. The reversal of 638378455259 is 952554873836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638378455259 - 2⁸ = 638378455003 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 638378455195 and 638378455204.

It is not a weakly prime, because it can be changed into another prime (638378455289) 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, 319189227629 + 319189227630.

It is an arithmetic number, because the mean of its divisors is an integer number (319189227630).

Almost surely, 2^638378455259 is an apocalyptic number.

638378455259 is a deficient number, since it is larger than the sum of its proper divisors (1).

638378455259 is an equidigital number, since it uses as much as digits as its factorization.

638378455259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728000, while the sum is 65.

The spelling of 638378455259 in words is "six hundred thirty-eight billion, three hundred seventy-eight million, four hundred fifty-five thousand, two hundred fifty-nine".