81738594167 has 2 divisors, whose sum is σ = 81738594168. Its totient is φ = 81738594166.

The previous prime is 81738594121. The next prime is 81738594191. The reversal of 81738594167 is 76149583718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81738594167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81738524167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40869297083 + 40869297084.

It is an arithmetic number, because the mean of its divisors is an integer number (40869297084).

Almost surely, 2^81738594167 is an apocalyptic number.

81738594167 is a deficient number, since it is larger than the sum of its proper divisors (1).

81738594167 is an equidigital number, since it uses as much as digits as its factorization.

81738594167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 59.

The spelling of 81738594167 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred ninety-four thousand, one hundred sixty-seven".