16665222 has 32 divisors (see below), whose sum is σ = 38218752. Its totient is φ = 4745664.

The previous prime is 16665221. The next prime is 16665241. The reversal of 16665222 is 22256661.

It is a self number, because there is not a number n which added to its sum of digits gives 16665222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665221) 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, 19018 + ... + 19874.

It is an arithmetic number, because the mean of its divisors is an integer number (1194336).

Almost surely, 2^16665222 is an apocalyptic number.

16665222 is an abundant number, since it is smaller than the sum of its proper divisors (21553530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16665222 is a wasteful number, since it uses less digits than its factorization.

16665222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 8640, while the sum is 30.

The square root of 16665222 is about 4082.3059659952. The cubic root of 16665222 is about 255.4290968400.

The spelling of 16665222 in words is "sixteen million, six hundred sixty-five thousand, two hundred twenty-two".