16722369225 has 81 divisors (see below), whose sum is σ = 30915685983. Its totient is φ = 8640311040.

The previous prime is 16722369199. The next prime is 16722369227. The reversal of 16722369225 is 52296322761.

The square root of 16722369225 is 129315.

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

16722369225 is a `hidden beast` number, since 1 + 67 + 2 + 2 + 369 + 225 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 8439913161 + 8282456064 = 91869^2 + 91008^2 .

It is not a de Polignac number, because 16722369225 - 2²⁹ = 16185498313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (16722369227) by changing a digit.

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 80 ways as a sum of consecutive naturals, for example, 71769709 + ... + 71769941.

Almost surely, 2^16722369225 is an apocalyptic number.

16722369225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16722369225 is the 129315-th square number.

16722369225 is the 64658-th centered octagonal number.

It is an amenable number.

16722369225 is a deficient number, since it is larger than the sum of its proper divisors (14193316758).

16722369225 is an equidigital number, since it uses as much as digits as its factorization.

16722369225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 278 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 16722369225 in words is "sixteen billion, seven hundred twenty-two million, three hundred sixty-nine thousand, two hundred twenty-five".