225672315721 has 2 divisors, whose sum is σ = 225672315722. Its totient is φ = 225672315720.

The previous prime is 225672315691. The next prime is 225672315731. The reversal of 225672315721 is 127513276522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155542683321 + 70129632400 = 394389^2 + 264820^2 .

It is a cyclic number.

It is not a de Polignac number, because 225672315721 - 2²¹ = 225670218569 is a prime.

It is not a weakly prime, because it can be changed into another prime (225672315731) 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, 112836157860 + 112836157861.

It is an arithmetic number, because the mean of its divisors is an integer number (112836157861).

Almost surely, 2^225672315721 is an apocalyptic number.

It is an amenable number.

225672315721 is a deficient number, since it is larger than the sum of its proper divisors (1).

225672315721 is an equidigital number, since it uses as much as digits as its factorization.

225672315721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 43.

The spelling of 225672315721 in words is "two hundred twenty-five billion, six hundred seventy-two million, three hundred fifteen thousand, seven hundred twenty-one".