81161068176 has 50 divisors (see below), whose sum is σ = 234903681782. Its totient is φ = 27053688960.

The previous prime is 81161068159. The next prime is 81161068181. The reversal of 81161068176 is 67186016118.

81161068176 is a `hidden beast` number, since 8 + 11 + 610 + 6 + 8 + 17 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52422681600 + 28738386576 = 228960^2 + 169524^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31310845 + ... + 31313436.

Almost surely, 2^81161068176 is an apocalyptic number.

It is an amenable number.

81161068176 is an abundant number, since it is smaller than the sum of its proper divisors (153742613606).

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

81161068176 is a wasteful number, since it uses less digits than its factorization.

81161068176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62624301 (or 62624286 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 81161068176 in words is "eighty-one billion, one hundred sixty-one million, sixty-eight thousand, one hundred seventy-six".