225115240661 has 4 divisors (see below), whose sum is σ = 225449736492. Its totient is φ = 224780744832.

The previous prime is 225115240619. The next prime is 225115240717. The reversal of 225115240661 is 166042511522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120986404561 + 104128836100 = 347831^2 + 322690^2 .

It is a cyclic number.

It is not a de Polignac number, because 225115240661 - 2¹⁰ = 225115239637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225115240601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167246906 + ... + 167248251.

It is an arithmetic number, because the mean of its divisors is an integer number (56362434123).

Almost surely, 2^225115240661 is an apocalyptic number.

It is an amenable number.

225115240661 is a deficient number, since it is larger than the sum of its proper divisors (334495831).

225115240661 is an equidigital number, since it uses as much as digits as its factorization.

225115240661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334495830.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 225115240661 in words is "two hundred twenty-five billion, one hundred fifteen million, two hundred forty thousand, six hundred sixty-one".