638841174743 has 2 divisors, whose sum is σ = 638841174744. Its totient is φ = 638841174742.

The previous prime is 638841174701. The next prime is 638841174767. The reversal of 638841174743 is 347471148836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638841174743 is a prime.

It is a super-2 number, since 2×638841174743² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638841174043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319420587371 + 319420587372.

It is an arithmetic number, because the mean of its divisors is an integer number (319420587372).

Almost surely, 2^638841174743 is an apocalyptic number.

638841174743 is a deficient number, since it is larger than the sum of its proper divisors (1).

638841174743 is an equidigital number, since it uses as much as digits as its factorization.

638841174743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 56.

The spelling of 638841174743 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred seventy-four thousand, seven hundred forty-three".