81228533167 has 2 divisors, whose sum is σ = 81228533168. Its totient is φ = 81228533166.

The previous prime is 81228533159. The next prime is 81228533173. The reversal of 81228533167 is 76133582218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81228533167 - 2³ = 81228533159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81228533147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40614266583 + 40614266584.

It is an arithmetic number, because the mean of its divisors is an integer number (40614266584).

Almost surely, 2^81228533167 is an apocalyptic number.

81228533167 is a deficient number, since it is larger than the sum of its proper divisors (1).

81228533167 is an equidigital number, since it uses as much as digits as its factorization.

81228533167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The spelling of 81228533167 in words is "eighty-one billion, two hundred twenty-eight million, five hundred thirty-three thousand, one hundred sixty-seven".