22661 has 8 divisors (see below), whose sum is σ = 25344.
Its totient is φ = 20160.
The previous prime is 22651. The next prime is 22669. The reversal of 22661 is 16622.
22661 is nontrivially palindromic in base 5 and base 16.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 22661 - 214 = 6277 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (17).
It is a Duffinian number.
22661 is an undulating number in base 6.
It is a plaindrome in base 12 and base 15.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22669) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 548.
It is an arithmetic number, because the mean of its divisors is an integer number (3168).
222661 is an apocalyptic number.
It is an amenable number.
22661 is a deficient number, since it is larger than the sum of its proper divisors (2683).
22661 is a wasteful number, since it uses less digits than its factorization.
22661 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 91.
The product of its digits is 144, while the sum is 17.
The square root of 22661 is about 150.5357100491.
The cubic root of 22661 is about 28.2982572480.
The spelling of 22661 in words is "twenty-two thousand, six hundred sixty-one".