81790170176 has 168 divisors, whose sum is σ = 193269924864. Its totient is φ = 34041047040.

The previous prime is 81790170167. The next prime is 81790170179. The reversal of 81790170176 is 67107109718.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81790170176.

It is not an unprimeable number, because it can be changed into a prime (81790170179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15107246 + ... + 15112658.

Almost surely, 2^81790170176 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81790170176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96634962432).

81790170176 is an abundant number, since it is smaller than the sum of its proper divisors (111479754688).

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

81790170176 is a wasteful number, since it uses less digits than its factorization.

81790170176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589 (or 5566 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 47.

The spelling of 81790170176 in words is "eighty-one billion, seven hundred ninety million, one hundred seventy thousand, one hundred seventy-six".