81818471083 has 4 divisors (see below), whose sum is σ = 81898607728. Its totient is φ = 81738334440.

The previous prime is 81818471069. The next prime is 81818471087. The reversal of 81818471083 is 38017481818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38017481818 = 2 ⋅19008740909.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81818471083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81818471087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40066791 + ... + 40068832.

It is an arithmetic number, because the mean of its divisors is an integer number (20474651932).

Almost surely, 2^81818471083 is an apocalyptic number.

81818471083 is a deficient number, since it is larger than the sum of its proper divisors (80136645).

81818471083 is a wasteful number, since it uses less digits than its factorization.

81818471083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80136644.

The product of its (nonzero) digits is 344064, while the sum is 49.

The spelling of 81818471083 in words is "eighty-one billion, eight hundred eighteen million, four hundred seventy-one thousand, eighty-three".