16541818225 has 27 divisors (see below), whose sum is σ = 21267526657. Its totient is φ = 12762723680.

The previous prime is 16541818187. The next prime is 16541818243. The reversal of 16541818225 is 52281814561.

The square root of 16541818225 is 128615.

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 227376241 + 16314441984 = 15079^2 + 127728^2 .

It is not a de Polignac number, because 16541818225 - 2¹⁷ = 16541687153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18648732 + ... + 18649618.

Almost surely, 2^16541818225 is an apocalyptic number.

16541818225 is the 128615-th square number.

16541818225 is the 64308-th centered octagonal number.

It is an amenable number.

16541818225 is a deficient number, since it is larger than the sum of its proper divisors (4725708432).

16541818225 is an frugal number, since it uses more digits than its factorization.

16541818225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842 (or 921 counting only the distinct ones).

The product of its digits is 153600, while the sum is 43.

The spelling of 16541818225 in words is "sixteen billion, five hundred forty-one million, eight hundred eighteen thousand, two hundred twenty-five".