81014806161 has 27 divisors (see below), whose sum is σ = 124332193713. Its totient is φ = 50823711360.

The previous prime is 81014806151. The next prime is 81014806183. The reversal of 81014806161 is 16160841018.

The square root of 81014806161 is 284631.

It is a perfect power (a square), and thus also a powerful number.

81014806161 is a `hidden beast` number, since 8 + 10 + 1 + 480 + 6 + 161 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 900900225 + 80113905936 = 30015^2 + 283044^2 .

It is not a de Polignac number, because 81014806161 - 2⁹ = 81014805649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81014806151) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 14513391 + ... + 14518971.

Almost surely, 2^81014806161 is an apocalyptic number.

81014806161 is the 284631-st square number.

81014806161 is the 142316-th centered octagonal number.

It is an amenable number.

81014806161 is a deficient number, since it is larger than the sum of its proper divisors (43317387552).

81014806161 is an frugal number, since it uses more digits than its factorization.

81014806161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11202 (or 5601 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

Multiplying 81014806161 by its sum of digits (36), we get a square (2916533021796 = 1707786²).

Multiplying 81014806161 by its product of nonzero digits (9216), we get a square (746632453579776 = 27324576²).

The spelling of 81014806161 in words is "eighty-one billion, fourteen million, eight hundred six thousand, one hundred sixty-one".