81737933886 has 96 divisors (see below), whose sum is σ = 214379006400. Its totient is φ = 21972307968.

The previous prime is 81737933857. The next prime is 81737933891. The reversal of 81737933886 is 68833973718.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9028290 + ... + 9037338.

It is an arithmetic number, because the mean of its divisors is an integer number (2233114650).

Almost surely, 2^81737933886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81737933886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107189503200).

81737933886 is an abundant number, since it is smaller than the sum of its proper divisors (132641072514).

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

81737933886 is a wasteful number, since it uses less digits than its factorization.

81737933886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13298 (or 13295 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 81737933886 in words is "eighty-one billion, seven hundred thirty-seven million, nine hundred thirty-three thousand, eight hundred eighty-six".