22818661 has 4 divisors (see below), whose sum is σ = 22909824. Its totient is φ = 22727500.

The previous prime is 22818643. The next prime is 22818671. The reversal of 22818661 is 16681822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16681822 = 2 ⋅8340911.

It is a cyclic number.

It is not a de Polignac number, because 22818661 - 2⁹ = 22818149 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 (22818671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45205 + ... + 45706.

It is an arithmetic number, because the mean of its divisors is an integer number (5727456).

Almost surely, 2^22818661 is an apocalyptic number.

It is an amenable number.

22818661 is a deficient number, since it is larger than the sum of its proper divisors (91163).

22818661 is an equidigital number, since it uses as much as digits as its factorization.

22818661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91162.

The product of its digits is 9216, while the sum is 34.

The square root of 22818661 is about 4776.8882130525. Note that the first 3 decimals coincide. The cubic root of 22818661 is about 283.6373280075.

The spelling of 22818661 in words is "twenty-two million, eight hundred eighteen thousand, six hundred sixty-one".