81801370343 has 24 divisors (see below), whose sum is σ = 103352912544. Its totient is φ = 63372767040.

The previous prime is 81801370223. The next prime is 81801370363. The reversal of 81801370343 is 34307310818.

It is not a de Polignac number, because 81801370343 - 2²² = 81797176039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81801370297 and 81801370306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81801370363) 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 23 ways as a sum of consecutive naturals, for example, 132596 + ... + 425657.

It is an arithmetic number, because the mean of its divisors is an integer number (4306371356).

Almost surely, 2^81801370343 is an apocalyptic number.

81801370343 is a deficient number, since it is larger than the sum of its proper divisors (21551542201).

81801370343 is a wasteful number, since it uses less digits than its factorization.

81801370343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558455 (or 558444 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 81801370343 in words is "eighty-one billion, eight hundred one million, three hundred seventy thousand, three hundred forty-three".