2218408805 has 8 divisors (see below), whose sum is σ = 2681522712. Its totient is φ = 1761772288.

The previous prime is 2218408781. The next prime is 2218408807. The reversal of 2218408805 is 5088048122.

It can be written as a sum of positive squares in 4 ways, for example, as 1223236 + 2217185569 = 1106^2 + 47087^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2218408805 is a prime.

It is a super-2 number, since 2×2218408805² = 9842675252203056050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218408807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1618592 + ... + 1619961.

It is an arithmetic number, because the mean of its divisors is an integer number (335190339).

Almost surely, 2^2218408805 is an apocalyptic number.

It is an amenable number.

2218408805 is a deficient number, since it is larger than the sum of its proper divisors (463113907).

2218408805 is a wasteful number, since it uses less digits than its factorization.

2218408805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238695.

The product of its (nonzero) digits is 40960, while the sum is 38.

The square root of 2218408805 is about 47099.9873142233. The cubic root of 2218408805 is about 1304.2090018183.

The spelling of 2218408805 in words is "two billion, two hundred eighteen million, four hundred eight thousand, eight hundred five".