81085001180 has 24 divisors (see below), whose sum is σ = 172433929920. Its totient is φ = 32023442880.

The previous prime is 81085001171. The next prime is 81085001183. The reversal of 81085001180 is 8110058018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81085001183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25658231 + ... + 25661390.

It is an arithmetic number, because the mean of its divisors is an integer number (7184747080).

Almost surely, 2^81085001180 is an apocalyptic number.

It is an amenable number.

81085001180 is an abundant number, since it is smaller than the sum of its proper divisors (91348928740).

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

81085001180 is a wasteful number, since it uses less digits than its factorization.

81085001180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51319709 (or 51319707 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 32.

Adding to 81085001180 its reverse (8110058018), we get a palindrome (89195059198).

The spelling of 81085001180 in words is "eighty-one billion, eighty-five million, one thousand, one hundred eighty".