838198161891791 has 2 divisors, whose sum is σ = 838198161891792. Its totient is φ = 838198161891790.

The previous prime is 838198161891767. The next prime is 838198161891847. The reversal of 838198161891791 is 197198161891838.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-838198161891791 is a prime.

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 (838198161891721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419099080945895 + 419099080945896.

It is an arithmetic number, because the mean of its divisors is an integer number (419099080945896).

Almost surely, 2^{838198161891791} is an apocalyptic number.

838198161891791 is a deficient number, since it is larger than the sum of its proper divisors (1).

838198161891791 is an equidigital number, since it uses as much as digits as its factorization.

838198161891791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376233984, while the sum is 80.

The spelling of 838198161891791 in words is "eight hundred thirty-eight trillion, one hundred ninety-eight billion, one hundred sixty-one million, eight hundred ninety-one thousand, seven hundred ninety-one".