2218208408538 has 64 divisors (see below), whose sum is σ = 4607550293760. Its totient is φ = 711084068352.

The previous prime is 2218208408501. The next prime is 2218208408593. The reversal of 2218208408538 is 8358048028122.

It is a happy number.

It is a super-2 number, since 2×2218208408538² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184736931 + ... + 184748937.

It is an arithmetic number, because the mean of its divisors is an integer number (71992973340).

Almost surely, 2^{2218208408538} is an apocalyptic number.

2218208408538 is an abundant number, since it is smaller than the sum of its proper divisors (2389341885222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2218208408538 is a wasteful number, since it uses less digits than its factorization.

2218208408538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16151.

The product of its (nonzero) digits is 1966080, while the sum is 51.

The spelling of 2218208408538 in words is "two trillion, two hundred eighteen billion, two hundred eight million, four hundred eight thousand, five hundred thirty-eight".