4225661221025 has 12 divisors (see below), whose sum is σ = 5239905692652. Its totient is φ = 3380473635840.

The previous prime is 4225661221007. The next prime is 4225661221039. The reversal of 4225661221025 is 5201221665224.

It can be written as a sum of positive squares in 6 ways, for example, as 1255925903761 + 2969735317264 = 1120681^2 + 1723292^2 .

It is not a de Polignac number, because 4225661221025 - 2¹⁴ = 4225661204641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4225661221025.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210149 + ... + 2914701.

It is an arithmetic number, because the mean of its divisors is an integer number (436658807721).

Almost surely, 2^{4225661221025} is an apocalyptic number.

It is an amenable number.

4225661221025 is a deficient number, since it is larger than the sum of its proper divisors (1014244471627).

4225661221025 is a wasteful number, since it uses less digits than its factorization.

4225661221025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767060 (or 2767055 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 4225661221025 its reverse (5201221665224), we get a palindrome (9426882886249).

The spelling of 4225661221025 in words is "four trillion, two hundred twenty-five billion, six hundred sixty-one million, two hundred twenty-one thousand, twenty-five".