225666020256261 has 16 divisors (see below), whose sum is σ = 324034335389184. Its totient is φ = 138870936137664.

The previous prime is 225666020256199. The next prime is 225666020256293. The reversal of 225666020256261 is 162652020666522.

It is not a de Polignac number, because 225666020256261 - 2⁶ = 225666020256197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225666020256661) 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, 2490220 + ... + 21390026.

It is an arithmetic number, because the mean of its divisors is an integer number (20252145961824).

Almost surely, 2^{225666020256261} is an apocalyptic number.

It is an amenable number.

225666020256261 is a deficient number, since it is larger than the sum of its proper divisors (98368315132923).

225666020256261 is a wasteful number, since it uses less digits than its factorization.

225666020256261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19205980.

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 225666020256261 in words is "two hundred twenty-five trillion, six hundred sixty-six billion, twenty million, two hundred fifty-six thousand, two hundred sixty-one".