81175106500 has 24 divisors (see below), whose sum is σ = 177286433688. Its totient is φ = 32470042400.

The previous prime is 81175106479. The next prime is 81175106501. The reversal of 81175106500 is 560157118.

It can be written as a sum of positive squares in 4 ways, for example, as 12451435396 + 68723671104 = 111586^2 + 262152^2 .

It is not an unprimeable number, because it can be changed into a prime (81175106501) 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, 81174607 + ... + 81175606.

It is an arithmetic number, because the mean of its divisors is an integer number (7386934737).

Almost surely, 2^81175106500 is an apocalyptic number.

It is an amenable number.

81175106500 is an abundant number, since it is smaller than the sum of its proper divisors (96111327188).

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

81175106500 is a wasteful number, since it uses less digits than its factorization.

81175106500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162350232 (or 162350220 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 34.

The spelling of 81175106500 in words is "eighty-one billion, one hundred seventy-five million, one hundred six thousand, five hundred".