638574208193 has 2 divisors, whose sum is σ = 638574208194. Its totient is φ = 638574208192.

The previous prime is 638574208147. The next prime is 638574208229. The reversal of 638574208193 is 391802475836.

638574208193 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491649185329 + 146925022864 = 701177^2 + 383308^2 .

It is a cyclic number.

It is not a de Polignac number, because 638574208193 - 2¹⁴ = 638574191809 is a prime.

It is not a weakly prime, because it can be changed into another prime (638574208133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319287104096 + 319287104097.

It is an arithmetic number, because the mean of its divisors is an integer number (319287104097).

It is a 1-persistent number, because it is pandigital, but 2⋅638574208193 = 1277148416386 is not.

Almost surely, 2^638574208193 is an apocalyptic number.

It is an amenable number.

638574208193 is a deficient number, since it is larger than the sum of its proper divisors (1).

638574208193 is an equidigital number, since it uses as much as digits as its factorization.

638574208193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 638574208193 in words is "six hundred thirty-eight billion, five hundred seventy-four million, two hundred eight thousand, one hundred ninety-three".