81272823106125 has 64 divisors (see below), whose sum is σ = 157177310883840. Its totient is φ = 36523573704000.

The previous prime is 81272823106117. The next prime is 81272823106129. The reversal of 81272823106125 is 52160132827218.

It is not a de Polignac number, because 81272823106125 - 2³ = 81272823106117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272823106129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 262227121 + ... + 262536870.

It is an arithmetic number, because the mean of its divisors is an integer number (2455895482560).

Almost surely, 2^{81272823106125} is an apocalyptic number.

It is an amenable number.

81272823106125 is a deficient number, since it is larger than the sum of its proper divisors (75904487777715).

81272823106125 is a wasteful number, since it uses less digits than its factorization.

81272823106125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524764075 (or 524764065 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 81272823106125 in words is "eighty-one trillion, two hundred seventy-two billion, eight hundred twenty-three million, one hundred six thousand, one hundred twenty-five".