2218806261 has 24 divisors (see below), whose sum is σ = 3664215360. Its totient is φ = 1267396416.

The previous prime is 2218806259. The next prime is 2218806281. The reversal of 2218806261 is 1626088122.

2218806261 is a `hidden beast` number, since 2 + 21 + 8 + 8 + 0 + 626 + 1 = 666.

It is not a de Polignac number, because 2218806261 - 2¹ = 2218806259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218806241) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 211150 + ... + 221408.

It is an arithmetic number, because the mean of its divisors is an integer number (152675640).

Almost surely, 2^2218806261 is an apocalyptic number.

2218806261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2218806261 is a deficient number, since it is larger than the sum of its proper divisors (1445409099).

2218806261 is a wasteful number, since it uses less digits than its factorization.

2218806261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13705 (or 13702 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 2218806261 is about 47104.2064045240. The cubic root of 2218806261 is about 1304.2868856808.

The spelling of 2218806261 in words is "two billion, two hundred eighteen million, eight hundred six thousand, two hundred sixty-one".