225651565657 has 12 divisors (see below), whose sum is σ = 262527390900. Its totient is φ = 193390020096.

The previous prime is 225651565649. The next prime is 225651565663. The reversal of 225651565657 is 756565156522.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50940941401 + 174710624256 = 225701^2 + 417984^2 .

It is not a de Polignac number, because 225651565657 - 2³ = 225651565649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225651565598 and 225651565607.

It is not an unprimeable number, because it can be changed into a prime (225651565637) 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 in 11 ways as a sum of consecutive naturals, for example, 73773 + ... + 675829.

It is an arithmetic number, because the mean of its divisors is an integer number (21877282575).

Almost surely, 2^225651565657 is an apocalyptic number.

It is an amenable number.

225651565657 is a deficient number, since it is larger than the sum of its proper divisors (36875825243).

225651565657 is an equidigital number, since it uses as much as digits as its factorization.

225651565657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609720 (or 609713 counting only the distinct ones).

The product of its digits is 18900000, while the sum is 55.

The spelling of 225651565657 in words is "two hundred twenty-five billion, six hundred fifty-one million, five hundred sixty-five thousand, six hundred fifty-seven".