2220538081609 has 27 divisors (see below), whose sum is σ = 2358883297197. Its totient is φ = 2090127866904.

The previous prime is 2220538081591. The next prime is 2220538081667. The reversal of 2220538081609 is 9061808350222.

The square root of 2220538081609 is 1490147.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2220538081609 - 2²⁵ = 2220504527177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2220538081309) 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 26 ways as a sum of consecutive naturals, for example, 2296316044 + ... + 2296317010.

Almost surely, 2^{2220538081609} is an apocalyptic number.

2220538081609 is the 1490147-th square number.

2220538081609 is the 745074-th centered octagonal number.

It is an amenable number.

2220538081609 is a deficient number, since it is larger than the sum of its proper divisors (138345215588).

2220538081609 is an frugal number, since it uses more digits than its factorization.

2220538081609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 2220538081609 in words is "two trillion, two hundred twenty billion, five hundred thirty-eight million, eighty-one thousand, six hundred nine".