16469872225 has 9 divisors (see below), whose sum is σ = 20423437267. Its totient is φ = 13175384440.

The previous prime is 16469872213. The next prime is 16469872247. The reversal of 16469872225 is 52227896461.

It is a happy number.

The square root of 16469872225 is 128335.

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

It can be written as a sum of positive squares in only one way, i.e., 5929154001 + 10540718224 = 77001^2 + 102668^2 .

It is not a de Polignac number, because 16469872225 - 2²¹ = 16467775073 is a prime.

It is a super-2 number, since 2×16469872225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 628842 + ... + 654508.

Almost surely, 2^16469872225 is an apocalyptic number.

16469872225 is the 128335-th square number.

16469872225 is the 64168-th centered octagonal number.

It is an amenable number.

16469872225 is a deficient number, since it is larger than the sum of its proper divisors (3953565042).

16469872225 is an frugal number, since it uses more digits than its factorization.

16469872225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51344 (or 25672 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 16469872225 in words is "sixteen billion, four hundred sixty-nine million, eight hundred seventy-two thousand, two hundred twenty-five".