2243881165681 has 9 divisors (see below), whose sum is σ = 2269511437323. Its totient is φ = 2218537197360.

The previous prime is 2243881165639. The next prime is 2243881165717. The reversal of 2243881165681 is 1865611883422.

The square root of 2243881165681 is 1497959.

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

2243881165681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 430872775281 + 1813008390400 = 656409^2 + 1346480^2 .

It is not a de Polignac number, because 2243881165681 - 2²³ = 2243872777073 is a prime.

It is a super-2 number, since 2×2243881165681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2243881105681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 133309936 + ... + 133326766.

Almost surely, 2^{2243881165681} is an apocalyptic number.

2243881165681 is the 1497959-th square number.

2243881165681 is the 748980-th centered octagonal number.

It is an amenable number.

2243881165681 is a deficient number, since it is larger than the sum of its proper divisors (25630271642).

2243881165681 is an frugal number, since it uses more digits than its factorization.

2243881165681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33840 (or 16920 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 55.

The spelling of 2243881165681 in words is "two trillion, two hundred forty-three billion, eight hundred eighty-one million, one hundred sixty-five thousand, six hundred eighty-one".