638819282287 has 2 divisors, whose sum is σ = 638819282288. Its totient is φ = 638819282286.

The previous prime is 638819282279. The next prime is 638819282363. The reversal of 638819282287 is 782282918836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638819282287 - 2³ = 638819282279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638819282267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319409641143 + 319409641144.

It is an arithmetic number, because the mean of its divisors is an integer number (319409641144).

Almost surely, 2^638819282287 is an apocalyptic number.

638819282287 is a deficient number, since it is larger than the sum of its proper divisors (1).

638819282287 is an equidigital number, since it uses as much as digits as its factorization.

638819282287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37158912, while the sum is 64.

The spelling of 638819282287 in words is "six hundred thirty-eight billion, eight hundred nineteen million, two hundred eighty-two thousand, two hundred eighty-seven".