225138908765 has 4 divisors (see below), whose sum is σ = 270166690524. Its totient is φ = 180111127008.

The previous prime is 225138908749. The next prime is 225138908773. The reversal of 225138908765 is 567809831522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 567809831522 = 2 ⋅283904915761.

It can be written as a sum of positive squares in 2 ways, for example, as 91558892569 + 133580016196 = 302587^2 + 365486^2 .

It is a cyclic number.

It is not a de Polignac number, because 225138908765 - 2⁴ = 225138908749 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 225138908765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22513890872 + ... + 22513890881.

It is an arithmetic number, because the mean of its divisors is an integer number (67541672631).

Almost surely, 2^225138908765 is an apocalyptic number.

It is an amenable number.

225138908765 is a deficient number, since it is larger than the sum of its proper divisors (45027781759).

225138908765 is an equidigital number, since it uses as much as digits as its factorization.

225138908765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45027781758.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 225138908765 in words is "two hundred twenty-five billion, one hundred thirty-eight million, nine hundred eight thousand, seven hundred sixty-five".