216677881 has 16 divisors (see below), whose sum is σ = 261106560. Its totient is φ = 175651200.

The previous prime is 216677873. The next prime is 216677893. The reversal of 216677881 is 188776612.

It is not a de Polignac number, because 216677881 - 2³ = 216677873 is a prime.

It is a super-2 number, since 2×216677881² = 93898608229300322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216677831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113031 + ... + 114931.

It is an arithmetic number, because the mean of its divisors is an integer number (16319160).

Almost surely, 2^216677881 is an apocalyptic number.

It is an amenable number.

216677881 is a deficient number, since it is larger than the sum of its proper divisors (44428679).

216677881 is a wasteful number, since it uses less digits than its factorization.

216677881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784.

The product of its digits is 225792, while the sum is 46.

The square root of 216677881 is about 14719.9823709134. The cubic root of 216677881 is about 600.6270121240.

The spelling of 216677881 in words is "two hundred sixteen million, six hundred seventy-seven thousand, eight hundred eighty-one".