81801370344 has 16 divisors (see below), whose sum is σ = 204503425920. Its totient is φ = 27267123440.

The previous prime is 81801370223. The next prime is 81801370363. The reversal of 81801370344 is 44307310818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704195192 + ... + 1704195239.

It is an arithmetic number, because the mean of its divisors is an integer number (12781464120).

Almost surely, 2^81801370344 is an apocalyptic number.

It is an amenable number.

81801370344 is an abundant number, since it is smaller than the sum of its proper divisors (122702055576).

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

81801370344 is a wasteful number, since it uses less digits than its factorization.

81801370344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408390440 (or 3408390436 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 81801370344 in words is "eighty-one billion, eight hundred one million, three hundred seventy thousand, three hundred forty-four".