81040701180 has 96 divisors (see below), whose sum is σ = 229474824768. Its totient is φ = 21367552000.

The previous prime is 81040701097. The next prime is 81040701187. The reversal of 81040701180 is 8110704018.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040701187) 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, 4602874 + ... + 4620446.

It is an arithmetic number, because the mean of its divisors is an integer number (2390362758).

Almost surely, 2^81040701180 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 81040701180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114737412384).

81040701180 is an abundant number, since it is smaller than the sum of its proper divisors (148434123588).

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

81040701180 is a wasteful number, since it uses less digits than its factorization.

81040701180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18447 (or 18445 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The spelling of 81040701180 in words is "eighty-one billion, forty million, seven hundred one thousand, one hundred eighty".