81841170125 has 64 divisors (see below), whose sum is σ = 120134327040. Its totient is φ = 54878112000.

The previous prime is 81841170119. The next prime is 81841170137. The reversal of 81841170125 is 52107114818.

It is a happy number.

It is not a de Polignac number, because 81841170125 - 2¹⁰ = 81841169101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19106234 + ... + 19110516.

It is an arithmetic number, because the mean of its divisors is an integer number (1877098860).

Almost surely, 2^81841170125 is an apocalyptic number.

It is an amenable number.

81841170125 is a deficient number, since it is larger than the sum of its proper divisors (38293156915).

81841170125 is a wasteful number, since it uses less digits than its factorization.

81841170125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391 (or 5381 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 38.

The spelling of 81841170125 in words is "eighty-one billion, eight hundred forty-one million, one hundred seventy thousand, one hundred twenty-five".