81081709460 has 12 divisors (see below), whose sum is σ = 170271589908. Its totient is φ = 32432683776.

The previous prime is 81081709459. The next prime is 81081709469. The reversal of 81081709460 is 6490718018.

It can be written as a sum of positive squares in 2 ways, for example, as 49050732676 + 32030976784 = 221474^2 + 178972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81081709469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027042717 + ... + 2027042756.

It is an arithmetic number, because the mean of its divisors is an integer number (14189299159).

Almost surely, 2^81081709460 is an apocalyptic number.

It is an amenable number.

81081709460 is an abundant number, since it is smaller than the sum of its proper divisors (89189880448).

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

81081709460 is a wasteful number, since it uses less digits than its factorization.

81081709460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054085482 (or 4054085480 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 81081709460 in words is "eighty-one billion, eighty-one million, seven hundred nine thousand, four hundred sixty".