81266843067 has 4 divisors (see below), whose sum is σ = 108355790760. Its totient is φ = 54177895376.

The previous prime is 81266843041. The next prime is 81266843083. The reversal of 81266843067 is 76034866218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81266843067 - 2⁷ = 81266842939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81266843767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13544473842 + ... + 13544473847.

It is an arithmetic number, because the mean of its divisors is an integer number (27088947690).

Almost surely, 2^81266843067 is an apocalyptic number.

81266843067 is a deficient number, since it is larger than the sum of its proper divisors (27088947693).

81266843067 is a wasteful number, since it uses less digits than its factorization.

81266843067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27088947692.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 81266843067 in words is "eighty-one billion, two hundred sixty-six million, eight hundred forty-three thousand, sixty-seven".