225011660121 has 12 divisors (see below), whose sum is σ = 325023860772. Its totient is φ = 150004534176.

The previous prime is 225011660101. The next prime is 225011660207. The reversal of 225011660121 is 121066110522.

225011660121 is a `hidden beast` number, since 2 + 2 + 50 + 1 + 1 + 6 + 601 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 216816884496 + 8194775625 = 465636^2 + 90525^2 .

It is not a de Polignac number, because 225011660121 - 2¹⁰ = 225011659097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225011660101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216055 + ... + 704771.

It is an arithmetic number, because the mean of its divisors is an integer number (27085321731).

Almost surely, 2^225011660121 is an apocalyptic number.

It is an amenable number.

225011660121 is a deficient number, since it is larger than the sum of its proper divisors (100012200651).

225011660121 is a wasteful number, since it uses less digits than its factorization.

225011660121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539880 (or 539877 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 225011660121 its reverse (121066110522), we get a palindrome (346077770643).

The spelling of 225011660121 in words is "two hundred twenty-five billion, eleven million, six hundred sixty thousand, one hundred twenty-one".