638570782853 has 2 divisors, whose sum is σ = 638570782854. Its totient is φ = 638570782852.

The previous prime is 638570782783. The next prime is 638570782867. The reversal of 638570782853 is 358287075836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634327823809 + 4242959044 = 796447^2 + 65138^2 .

It is a cyclic number.

It is not a de Polignac number, because 638570782853 - 2¹⁰ = 638570781829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638570787853) 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, 319285391426 + 319285391427.

It is an arithmetic number, because the mean of its divisors is an integer number (319285391427).

Almost surely, 2^638570782853 is an apocalyptic number.

It is an amenable number.

638570782853 is a deficient number, since it is larger than the sum of its proper divisors (1).

638570782853 is an equidigital number, since it uses as much as digits as its factorization.

638570782853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67737600, while the sum is 62.

The spelling of 638570782853 in words is "six hundred thirty-eight billion, five hundred seventy million, seven hundred eighty-two thousand, eight hundred fifty-three".