6221856753225 has 81 divisors (see below), whose sum is σ = 11218717865173. Its totient is φ = 3296233505280.

The previous prime is 6221856753169. The next prime is 6221856753263. The reversal of 6221856753225 is 5223576581226.

The square root of 6221856753225 is 2494365.

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

6221856753225 is a `hidden beast` number, since 6 + 2 + 2 + 1 + 8 + 567 + 53 + 2 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3127029892281 + 3094826860944 = 1768341^2 + 1759212^2 .

It is not a de Polignac number, because 6221856753225 - 2¹¹ = 6221856751177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 6697369561 + ... + 6697370489.

Almost surely, 2^{6221856753225} is an apocalyptic number.

6221856753225 is the 2494365-th square number.

6221856753225 is the 1247183-rd centered octagonal number.

It is an amenable number.

6221856753225 is a deficient number, since it is larger than the sum of its proper divisors (4996861111948).

6221856753225 is an frugal number, since it uses more digits than its factorization.

6221856753225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232 (or 1116 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 54.

The spelling of 6221856753225 in words is "six trillion, two hundred twenty-one billion, eight hundred fifty-six million, seven hundred fifty-three thousand, two hundred twenty-five".