22533661 has 4 divisors (see below), whose sum is σ = 22571392. Its totient is φ = 22495932.

The previous prime is 22533659. The next prime is 22533689. The reversal of 22533661 is 16633522.

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.

It is a cyclic number.

It is not a de Polignac number, because 22533661 - 2¹ = 22533659 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 (22533611) 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, 17955 + ... + 19168.

It is an arithmetic number, because the mean of its divisors is an integer number (5642848).

Almost surely, 2^22533661 is an apocalyptic number.

It is an amenable number.

22533661 is a deficient number, since it is larger than the sum of its proper divisors (37731).

22533661 is an equidigital number, since it uses as much as digits as its factorization.

22533661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37730.

The product of its digits is 6480, while the sum is 28.

The square root of 22533661 is about 4746.9633451292. The cubic root of 22533661 is about 282.4515216889.

The spelling of 22533661 in words is "twenty-two million, five hundred thirty-three thousand, six hundred sixty-one".