32216661 has 6 divisors (see below), whose sum is σ = 46535190. Its totient is φ = 21477768.

The previous prime is 32216641. The next prime is 32216669. The reversal of 32216661 is 16661223.

It can be written as a sum of positive squares in only one way, i.e., 28998225 + 3218436 = 5385^2 + 1794^2 .

It is not a de Polignac number, because 32216661 - 2¹¹ = 32214613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32216669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1789806 + ... + 1789823.

It is an arithmetic number, because the mean of its divisors is an integer number (7755865).

Almost surely, 2^32216661 is an apocalyptic number.

It is an amenable number.

32216661 is a deficient number, since it is larger than the sum of its proper divisors (14318529).

32216661 is a wasteful number, since it uses less digits than its factorization.

32216661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579635 (or 3579632 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 32216661 is about 5675.9722515178. The cubic root of 32216661 is about 318.1951158104.

Adding to 32216661 its reverse (16661223), we get a palindrome (48877884).

The spelling of 32216661 in words is "thirty-two million, two hundred sixteen thousand, six hundred sixty-one".