226215661 has 16 divisors (see below), whose sum is σ = 262465920. Its totient is φ = 190967040.

The previous prime is 226215611. The next prime is 226215677. The reversal of 226215661 is 166512622.

It is a cyclic number.

It is not a de Polignac number, because 226215661 - 2⁷ = 226215533 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 (226215611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205665 + ... + 206761.

It is an arithmetic number, because the mean of its divisors is an integer number (16404120).

Almost surely, 2^226215661 is an apocalyptic number.

It is an amenable number.

226215661 is a deficient number, since it is larger than the sum of its proper divisors (36250259).

226215661 is a wasteful number, since it uses less digits than its factorization.

226215661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its digits is 8640, while the sum is 31.

The square root of 226215661 is about 15040.4674461933. The cubic root of 226215661 is about 609.3136246439.

It can be divided in two parts, 22621 and 5661, that added together give a palindrome (28282).

The spelling of 226215661 in words is "two hundred twenty-six million, two hundred fifteen thousand, six hundred sixty-one".