81067746833 has 4 divisors (see below), whose sum is σ = 81069458148. Its totient is φ = 81066035520.

The previous prime is 81067746811. The next prime is 81067746883. The reversal of 81067746833 is 33864776018.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45093796609 + 35973950224 = 212353^2 + 189668^2 .

It is a cyclic number.

It is not a de Polignac number, because 81067746833 - 2¹⁶ = 81067681297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81067746883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782516 + ... + 880037.

It is an arithmetic number, because the mean of its divisors is an integer number (20267364537).

Almost surely, 2^81067746833 is an apocalyptic number.

It is an amenable number.

81067746833 is a deficient number, since it is larger than the sum of its proper divisors (1711315).

81067746833 is a wasteful number, since it uses less digits than its factorization.

81067746833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711314.

The product of its (nonzero) digits is 4064256, while the sum is 53.

The spelling of 81067746833 in words is "eighty-one billion, sixty-seven million, seven hundred forty-six thousand, eight hundred thirty-three".