2166881481 has 12 divisors (see below), whose sum is σ = 3130369008. Its totient is φ = 1444389624.

The previous prime is 2166881477. The next prime is 2166881533. The reversal of 2166881481 is 1841886612.

2166881481 is a `hidden beast` number, since 2 + 166 + 8 + 8 + 1 + 481 = 666.

2166881481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2166881481 - 2² = 2166881477 is a prime.

It is a super-3 number, since 3×2166881481³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2166881471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86886 + ... + 109008.

It is an arithmetic number, because the mean of its divisors is an integer number (260864084).

Almost surely, 2^2166881481 is an apocalyptic number.

It is an amenable number.

2166881481 is a deficient number, since it is larger than the sum of its proper divisors (963487527).

2166881481 is a wasteful number, since it uses less digits than its factorization.

2166881481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33012 (or 33009 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 2166881481 is about 46549.7742314611. The cubic root of 2166881481 is about 1294.0321089206.

The spelling of 2166881481 in words is "two billion, one hundred sixty-six million, eight hundred eighty-one thousand, four hundred eighty-one".