81547388567 has 2 divisors, whose sum is σ = 81547388568. Its totient is φ = 81547388566.

The previous prime is 81547388539. The next prime is 81547388603. The reversal of 81547388567 is 76588374518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81547388567 - 2¹⁶ = 81547323031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81547288567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40773694283 + 40773694284.

It is an arithmetic number, because the mean of its divisors is an integer number (40773694284).

Almost surely, 2^81547388567 is an apocalyptic number.

81547388567 is a deficient number, since it is larger than the sum of its proper divisors (1).

81547388567 is an equidigital number, since it uses as much as digits as its factorization.

81547388567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45158400, while the sum is 62.

The spelling of 81547388567 in words is "eighty-one billion, five hundred forty-seven million, three hundred eighty-eight thousand, five hundred sixty-seven".