2216881685 has 32 divisors (see below), whose sum is σ = 2902912992. Its totient is φ = 1618616320.

The previous prime is 2216881679. The next prime is 2216881717. The reversal of 2216881685 is 5861886122.

It can be written as a sum of positive squares in 16 ways, for example, as 85951441 + 2130930244 = 9271^2 + 46162^2 .

It is not a de Polignac number, because 2216881685 - 2¹⁶ = 2216816149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601067 + ... + 604743.

It is an arithmetic number, because the mean of its divisors is an integer number (90716031).

Almost surely, 2^2216881685 is an apocalyptic number.

It is an amenable number.

2216881685 is a deficient number, since it is larger than the sum of its proper divisors (686031307).

2216881685 is a wasteful number, since it uses less digits than its factorization.

2216881685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913.

The product of its digits is 368640, while the sum is 47.

The square root of 2216881685 is about 47083.7730539939. The cubic root of 2216881685 is about 1303.9096670224.

The spelling of 2216881685 in words is "two billion, two hundred sixteen million, eight hundred eighty-one thousand, six hundred eighty-five".