81908746171060 has 24 divisors (see below), whose sum is σ = 177939689959080. Its totient is φ = 31633722658944.

The previous prime is 81908746171027. The next prime is 81908746171067. The reversal of 81908746171060 is 6017164780918.

It can be written as a sum of positive squares in 4 ways, for example, as 3668741836816 + 78240004334244 = 1915396^2 + 8845338^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a junction number, because it is equal to n+sod(n) for n = 81908746170986 and 81908746171004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81908746171067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70610987499 + ... + 70610988658.

It is an arithmetic number, because the mean of its divisors is an integer number (7414153748295).

Almost surely, 2^{81908746171060} is an apocalyptic number.

It is an amenable number.

81908746171060 is an abundant number, since it is smaller than the sum of its proper divisors (96030943788020).

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

81908746171060 is a wasteful number, since it uses less digits than its factorization.

81908746171060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141221976195 (or 141221976193 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 81908746171060 in words is "eighty-one trillion, nine hundred eight billion, seven hundred forty-six million, one hundred seventy-one thousand, sixty".