16661222 has 8 divisors (see below), whose sum is σ = 25104576. Its totient is φ = 8293032.

The previous prime is 16661221. The next prime is 16661237. The reversal of 16661222 is 22216661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16661191 and 16661200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661221) 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, 18233 + ... + 19124.

It is an arithmetic number, because the mean of its divisors is an integer number (3138072).

Almost surely, 2^16661222 is an apocalyptic number.

16661222 is a deficient number, since it is larger than the sum of its proper divisors (8443354).

16661222 is a wasteful number, since it uses less digits than its factorization.

16661222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37582.

The product of its digits is 1728, while the sum is 26.

The square root of 16661222 is about 4081.8160174119. The cubic root of 16661222 is about 255.4086591056.

Adding to 16661222 its reverse (22216661), we get a palindrome (38877883).

The spelling of 16661222 in words is "sixteen million, six hundred sixty-one thousand, two hundred twenty-two".