27166123881 has 24 divisors (see below), whose sum is σ = 42267967560. Its totient is φ = 16713835776.

The previous prime is 27166123877. The next prime is 27166123891. The reversal of 27166123881 is 18832166172.

27166123881 is a `hidden beast` number, since 27 + 1 + 6 + 612 + 3 + 8 + 8 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 264875625 + 26901248256 = 16275^2 + 164016^2 .

It is not a de Polignac number, because 27166123881 - 2² = 27166123877 is a prime.

It is a super-2 number, since 2×27166123881² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27166123801) 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, 546805 + ... + 594413.

It is an arithmetic number, because the mean of its divisors is an integer number (1761165315).

Almost surely, 2^27166123881 is an apocalyptic number.

It is an amenable number.

27166123881 is a deficient number, since it is larger than the sum of its proper divisors (15101843679).

27166123881 is a wasteful number, since it uses less digits than its factorization.

27166123881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52505 (or 52502 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 27166123881 in words is "twenty-seven billion, one hundred sixty-six million, one hundred twenty-three thousand, eight hundred eighty-one".