22045661 has 16 divisors (see below), whose sum is σ = 25436160. Its totient is φ = 18910320.

The previous prime is 22045657. The next prime is 22045687. The reversal of 22045661 is 16654022.

It is not a de Polignac number, because 22045661 - 2² = 22045657 is a prime.

It is a super-2 number, since 2×22045661² = 972022337853842, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22045661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22045631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19436 + ... + 20538.

It is an arithmetic number, because the mean of its divisors is an integer number (1589760).

Almost surely, 2^22045661 is an apocalyptic number.

It is an amenable number.

22045661 is a deficient number, since it is larger than the sum of its proper divisors (3390499).

22045661 is a wasteful number, since it uses less digits than its factorization.

22045661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 22045661 is about 4695.2807157826. The cubic root of 22045661 is about 280.3976535260.

Adding to 22045661 its reverse (16654022), we get a palindrome (38699683).

The spelling of 22045661 in words is "twenty-two million, forty-five thousand, six hundred sixty-one".