226581661 has 16 divisors (see below), whose sum is σ = 245317248. Its totient is φ = 208499200.

The previous prime is 226581643. The next prime is 226581701. The reversal of 226581661 is 166185622.

226581661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 226581661 - 2¹⁵ = 226548893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 226581661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (226581161) 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, 157401 + ... + 158833.

It is an arithmetic number, because the mean of its divisors is an integer number (15332328).

Almost surely, 2^226581661 is an apocalyptic number.

It is an amenable number.

226581661 is a deficient number, since it is larger than the sum of its proper divisors (18735587).

226581661 is a wasteful number, since it uses less digits than its factorization.

226581661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its digits is 34560, while the sum is 37.

The square root of 226581661 is about 15052.6297038092. The cubic root of 226581661 is about 609.6420555214.

The spelling of 226581661 in words is "two hundred twenty-six million, five hundred eighty-one thousand, six hundred sixty-one".