225776603221 has 4 divisors (see below), whose sum is σ = 243144034252. Its totient is φ = 208409172192.

The previous prime is 225776603207. The next prime is 225776603233. The reversal of 225776603221 is 122306677522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122306677522 = 2 ⋅61153338761.

It can be written as a sum of positive squares in 2 ways, for example, as 151020840996 + 74755762225 = 388614^2 + 273415^2 .

It is not a de Polignac number, because 225776603221 - 2¹⁹ = 225776078933 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 (225776603021) 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, 8683715496 + ... + 8683715521.

It is an arithmetic number, because the mean of its divisors is an integer number (60786008563).

Almost surely, 2^225776603221 is an apocalyptic number.

It is an amenable number.

225776603221 is a deficient number, since it is larger than the sum of its proper divisors (17367431031).

225776603221 is a wasteful number, since it uses less digits than its factorization.

225776603221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17367431030.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 225776603221 in words is "two hundred twenty-five billion, seven hundred seventy-six million, six hundred three thousand, two hundred twenty-one".