2218533778650 has 48 divisors (see below), whose sum is σ = 6287958598464. Its totient is φ = 507093434880.

The previous prime is 2218533778639. The next prime is 2218533778673. The reversal of 2218533778650 is 568773358122.

It is a super-2 number, since 2×2218533778650² (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 23 ways as a sum of consecutive naturals, for example, 1056443607 + ... + 1056445706.

It is an arithmetic number, because the mean of its divisors is an integer number (130999137468).

Almost surely, 2^{2218533778650} is an apocalyptic number.

2218533778650 is an abundant number, since it is smaller than the sum of its proper divisors (4069424819814).

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

2218533778650 is a wasteful number, since it uses less digits than its factorization.

2218533778650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112889335 (or 2112889330 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 57.

The spelling of 2218533778650 in words is "two trillion, two hundred eighteen billion, five hundred thirty-three million, seven hundred seventy-eight thousand, six hundred fifty".