81366302836 has 96 divisors (see below), whose sum is σ = 186700066560. Its totient is φ = 30109169664.

The previous prime is 81366302821. The next prime is 81366302839. The reversal of 81366302836 is 63820366318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81366302839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 968310 + ... + 1048978.

It is an arithmetic number, because the mean of its divisors is an integer number (1944792360).

Almost surely, 2^81366302836 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 81366302836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93350033280).

81366302836 is an abundant number, since it is smaller than the sum of its proper divisors (105333763724).

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

81366302836 is a wasteful number, since it uses less digits than its factorization.

81366302836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80873 (or 80871 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 81366302836 in words is "eighty-one billion, three hundred sixty-six million, three hundred two thousand, eight hundred thirty-six".