225666444121 has 16 divisors (see below), whose sum is σ = 249563376000. Its totient is φ = 202967094528.

The previous prime is 225666443987. The next prime is 225666444127. The reversal of 225666444121 is 121444666522.

It is a cyclic number.

It is not a de Polignac number, because 225666444121 - 2¹⁹ = 225665919833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225666444127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148030 + ... + 687928.

It is an arithmetic number, because the mean of its divisors is an integer number (15597711000).

Almost surely, 2^225666444121 is an apocalyptic number.

It is an amenable number.

225666444121 is a deficient number, since it is larger than the sum of its proper divisors (23896931879).

225666444121 is a wasteful number, since it uses less digits than its factorization.

225666444121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541008.

The product of its digits is 552960, while the sum is 43.

The spelling of 225666444121 in words is "two hundred twenty-five billion, six hundred sixty-six million, four hundred forty-four thousand, one hundred twenty-one".