225661213177 has 4 divisors (see below), whose sum is σ = 226431388260. Its totient is φ = 224891038096.

The previous prime is 225661213121. The next prime is 225661213181. The reversal of 225661213177 is 771312166522.

It is a happy number.

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 125364856761 + 100296356416 = 354069^2 + 316696^2 .

It is a cyclic number.

It is not a de Polignac number, because 225661213177 - 2¹¹ = 225661211129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225661213117) 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, 385087102 + ... + 385087687.

It is an arithmetic number, because the mean of its divisors is an integer number (56607847065).

Almost surely, 2^225661213177 is an apocalyptic number.

It is an amenable number.

225661213177 is a deficient number, since it is larger than the sum of its proper divisors (770175083).

225661213177 is an equidigital number, since it uses as much as digits as its factorization.

225661213177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770175082.

The product of its digits is 211680, while the sum is 43.

Adding to 225661213177 its reverse (771312166522), we get a palindrome (996973379699).

The spelling of 225661213177 in words is "two hundred twenty-five billion, six hundred sixty-one million, two hundred thirteen thousand, one hundred seventy-seven".