81168345027 has 128 divisors (see below), whose sum is σ = 161346816000. Its totient is φ = 39033446400.

The previous prime is 81168345007. The next prime is 81168345073. The reversal of 81168345027 is 72054386118.

81168345027 is a `hidden beast` number, since 8 + 116 + 83 + 450 + 2 + 7 = 666.

It is not a de Polignac number, because 81168345027 - 2¹¹ = 81168342979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81168345007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2137099 + ... + 2174747.

It is an arithmetic number, because the mean of its divisors is an integer number (1260522000).

Almost surely, 2^81168345027 is an apocalyptic number.

81168345027 is a deficient number, since it is larger than the sum of its proper divisors (80178470973).

81168345027 is a wasteful number, since it uses less digits than its factorization.

81168345027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37754 (or 37748 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 81168345027 in words is "eighty-one billion, one hundred sixty-eight million, three hundred forty-five thousand, twenty-seven".