18569785441 has 27 divisors (see below), whose sum is σ = 19922904729. Its totient is φ = 17307507168.

The previous prime is 18569785427. The next prime is 18569785469. The reversal of 18569785441 is 14458796581.

The square root of 18569785441 is 136271.

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 3952008225 + 14617777216 = 62865^2 + 120904^2 .

It is not a de Polignac number, because 18569785441 - 2¹⁹ = 18569261153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18569785141) 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, 146218720 + ... + 146218846.

Almost surely, 2^18569785441 is an apocalyptic number.

18569785441 is the 136271-st square number.

18569785441 is the 68136-th centered octagonal number.

It is an amenable number.

18569785441 is a deficient number, since it is larger than the sum of its proper divisors (1353119288).

18569785441 is an frugal number, since it uses more digits than its factorization.

18569785441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 193 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 58.

The spelling of 18569785441 in words is "eighteen billion, five hundred sixty-nine million, seven hundred eighty-five thousand, four hundred forty-one".