16666226 has 4 divisors (see below), whose sum is σ = 24999342. Its totient is φ = 8333112.

The previous prime is 16666219. The next prime is 16666231. The reversal of 16666226 is 62266661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62266661 = 307 ⋅202823.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 1836025 = 3851^2 + 1355^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166555 + ... + 4166558.

Almost surely, 2^16666226 is an apocalyptic number.

16666226 is a deficient number, since it is larger than the sum of its proper divisors (8333116).

16666226 is an equidigital number, since it uses as much as digits as its factorization.

16666226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8333115.

The product of its digits is 31104, while the sum is 35.

The square root of 16666226 is about 4082.4289338579. The cubic root of 16666226 is about 255.4342261979.

The spelling of 16666226 in words is "sixteen million, six hundred sixty-six thousand, two hundred twenty-six".