163216881 has 12 divisors (see below), whose sum is σ = 249626052. Its totient is φ = 102410496.

The previous prime is 163216877. The next prime is 163216913. The reversal of 163216881 is 188612361.

163216881 is a `hidden beast` number, since 1 + 632 + 16 + 8 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138862656 + 24354225 = 11784^2 + 4935^2 .

It is not a de Polignac number, because 163216881 - 2² = 163216877 is a prime.

It is a super-2 number, since 2×163216881² = 53279500486736322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163216811) 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, 533236 + ... + 533541.

It is an arithmetic number, because the mean of its divisors is an integer number (20802171).

Almost surely, 2^163216881 is an apocalyptic number.

It is an amenable number.

163216881 is a deficient number, since it is larger than the sum of its proper divisors (86409171).

163216881 is a wasteful number, since it uses less digits than its factorization.

163216881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066800 (or 1066797 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 163216881 is about 12775.6362268186. The cubic root of 163216881 is about 546.4977247058.

The spelling of 163216881 in words is "one hundred sixty-three million, two hundred sixteen thousand, eight hundred eighty-one".