22555661 has 4 divisors (see below), whose sum is σ = 22774752. Its totient is φ = 22336572.

The previous prime is 22555639. The next prime is 22555667. The reversal of 22555661 is 16655522.

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 22555661 - 2¹⁴ = 22539277 is a prime.

It is a super-3 number, since 3×22555661³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22555667) 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, 109391 + ... + 109596.

It is an arithmetic number, because the mean of its divisors is an integer number (5693688).

Almost surely, 2^22555661 is an apocalyptic number.

It is an amenable number.

22555661 is a deficient number, since it is larger than the sum of its proper divisors (219091).

22555661 is a wasteful number, since it uses less digits than its factorization.

22555661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219090.

The product of its digits is 18000, while the sum is 32.

The square root of 22555661 is about 4749.2800507024. The cubic root of 22555661 is about 282.5434125468.

The spelling of 22555661 in words is "twenty-two million, five hundred fifty-five thousand, six hundred sixty-one".