81843217374 has 16 divisors (see below), whose sum is σ = 165216215808. Its totient is φ = 27026108952.

The previous prime is 81843217363. The next prime is 81843217381. The reversal of 81843217374 is 47371234818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63740182 + ... + 63741465.

It is an arithmetic number, because the mean of its divisors is an integer number (10326013488).

Almost surely, 2^81843217374 is an apocalyptic number.

81843217374 is an abundant number, since it is smaller than the sum of its proper divisors (83372998434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81843217374 is a wasteful number, since it uses less digits than its factorization.

81843217374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127481759.

The product of its digits is 903168, while the sum is 48.

The spelling of 81843217374 in words is "eighty-one billion, eight hundred forty-three million, two hundred seventeen thousand, three hundred seventy-four".