225066720661 has 2 divisors, whose sum is σ = 225066720662. Its totient is φ = 225066720660.

The previous prime is 225066720577. The next prime is 225066720667. The reversal of 225066720661 is 166027660522.

225066720661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174823498161 + 50243222500 = 418119^2 + 224150^2 .

It is a cyclic number.

It is not a de Polignac number, because 225066720661 - 2¹³ = 225066712469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225066720667) 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 as a sum of consecutive naturals, namely, 112533360330 + 112533360331.

It is an arithmetic number, because the mean of its divisors is an integer number (112533360331).

Almost surely, 2^225066720661 is an apocalyptic number.

It is an amenable number.

225066720661 is a deficient number, since it is larger than the sum of its proper divisors (1).

225066720661 is an equidigital number, since it uses as much as digits as its factorization.

225066720661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 225066720661 in words is "two hundred twenty-five billion, sixty-six million, seven hundred twenty thousand, six hundred sixty-one".