16637130225 has 27 divisors (see below), whose sum is σ = 29802414603. Its totient is φ = 8872104240.

The previous prime is 16637130217. The next prime is 16637130229. The reversal of 16637130225 is 52203173661.

The square root of 16637130225 is 128985.

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

16637130225 is a `hidden beast` number, since 1 + 6 + 637 + 13 + 0 + 2 + 2 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5989366881 + 10647763344 = 77391^2 + 103188^2 .

It is not a de Polignac number, because 16637130225 - 2³ = 16637130217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16637130225.

It is not an unprimeable number, because it can be changed into a prime (16637130229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1930476 + ... + 1939074.

Almost surely, 2^16637130225 is an apocalyptic number.

16637130225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16637130225 is the 128985-th square number.

16637130225 is the 64493-rd centered octagonal number.

It is an amenable number.

16637130225 is a deficient number, since it is larger than the sum of its proper divisors (13165284378).

16637130225 is an frugal number, since it uses more digits than its factorization.

16637130225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17214 (or 8607 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

Multiplying 16637130225 by its sum of digits (36), we get a square (598936688100 = 773910²).

The spelling of 16637130225 in words is "sixteen billion, six hundred thirty-seven million, one hundred thirty thousand, two hundred twenty-five".