16443189361 has 27 divisors (see below), whose sum is σ = 18481604769. Its totient is φ = 14624489088.

The previous prime is 16443189319. The next prime is 16443189377. The reversal of 16443189361 is 16398134461.

The square root of 16443189361 is 128231.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3360404961 + 13082784400 = 57969^2 + 114380^2 .

It is not a de Polignac number, because 16443189361 - 2²⁷ = 16308971633 is a prime.

It is a super-3 number, since 3×16443189361³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16443189311) 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, 41418415 + ... + 41418811.

Almost surely, 2^16443189361 is an apocalyptic number.

16443189361 is the 128231-st square number.

16443189361 is the 64116-th centered octagonal number.

It is an amenable number.

16443189361 is a deficient number, since it is larger than the sum of its proper divisors (2038415408).

16443189361 is an frugal number, since it uses more digits than its factorization.

16443189361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 433 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The spelling of 16443189361 in words is "sixteen billion, four hundred forty-three million, one hundred eighty-nine thousand, three hundred sixty-one".