225521936789 has 2 divisors, whose sum is σ = 225521936790. Its totient is φ = 225521936788.

The previous prime is 225521936747. The next prime is 225521936867. The reversal of 225521936789 is 987639125522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117111106225 + 108410830564 = 342215^2 + 329258^2 .

It is a cyclic number.

It is not a de Polignac number, because 225521936789 - 2²⁰ = 225520888213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225521936089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112760968394 + 112760968395.

It is an arithmetic number, because the mean of its divisors is an integer number (112760968395).

Almost surely, 2^225521936789 is an apocalyptic number.

It is an amenable number.

225521936789 is a deficient number, since it is larger than the sum of its proper divisors (1).

225521936789 is an equidigital number, since it uses as much as digits as its factorization.

225521936789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 59.

The spelling of 225521936789 in words is "two hundred twenty-five billion, five hundred twenty-one million, nine hundred thirty-six thousand, seven hundred eighty-nine".