43561116369 has 27 divisors (see below), whose sum is σ = 65193316123. Its totient is φ = 28027651344.

The previous prime is 43561116337. The next prime is 43561116377. The reversal of 43561116369 is 96361116534.

The square root of 43561116369 is 208713.

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

43561116369 is a `hidden beast` number, since 4 + 3 + 5 + 6 + 1 + 1 + 1 + 636 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22842392769 + 20718723600 = 151137^2 + 143940^2 .

It is not a de Polignac number, because 43561116369 - 2⁵ = 43561116337 is a prime.

It is a super-2 number, since 2×43561116369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43561316369) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18156832 + ... + 18159230.

Almost surely, 2^43561116369 is an apocalyptic number.

43561116369 is the 208713-rd square number.

43561116369 is the 104357-th centered octagonal number.

It is an amenable number.

43561116369 is a deficient number, since it is larger than the sum of its proper divisors (21632199754).

43561116369 is an frugal number, since it uses more digits than its factorization.

43561116369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862 (or 2431 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The spelling of 43561116369 in words is "forty-three billion, five hundred sixty-one million, one hundred sixteen thousand, three hundred sixty-nine".