81266170704 has 80 divisors (see below), whose sum is σ = 216562502208. Its totient is φ = 26240357376.

The previous prime is 81266170679. The next prime is 81266170751. The reversal of 81266170704 is 40707166218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302364 + ... + 503940.

Almost surely, 2^81266170704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81266170704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108281251104).

81266170704 is an abundant number, since it is smaller than the sum of its proper divisors (135296331504).

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

81266170704 is a wasteful number, since it uses less digits than its factorization.

81266170704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201852 (or 201846 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 81266170704 in words is "eighty-one billion, two hundred sixty-six million, one hundred seventy thousand, seven hundred four".