638841144743 has 2 divisors, whose sum is σ = 638841144744. Its totient is φ = 638841144742.

The previous prime is 638841144737. The next prime is 638841144757. The reversal of 638841144743 is 347441148836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638841144743 - 2¹² = 638841140647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638841147743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319420572371 + 319420572372.

It is an arithmetic number, because the mean of its divisors is an integer number (319420572372).

Almost surely, 2^638841144743 is an apocalyptic number.

638841144743 is a deficient number, since it is larger than the sum of its proper divisors (1).

638841144743 is an equidigital number, since it uses as much as digits as its factorization.

638841144743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6193152, while the sum is 53.

The spelling of 638841144743 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, seven hundred forty-three".