22065561 has 32 divisors (see below), whose sum is σ = 37579520. Its totient is φ = 12534912.

The previous prime is 22065553. The next prime is 22065577. The reversal of 22065561 is 16556022.

22065561 is a `hidden beast` number, since 2 + 2 + 0 + 655 + 6 + 1 = 666.

It is not a de Polignac number, because 22065561 - 2³ = 22065553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22065161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58971 + ... + 59343.

It is an arithmetic number, because the mean of its divisors is an integer number (1174360).

Almost surely, 2^22065561 is an apocalyptic number.

22065561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22065561 is a deficient number, since it is larger than the sum of its proper divisors (15513959).

22065561 is a wasteful number, since it uses less digits than its factorization.

22065561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 22065561 is about 4697.3993868948. The cubic root of 22065561 is about 280.4819971860.

The spelling of 22065561 in words is "twenty-two million, sixty-five thousand, five hundred sixty-one".