16664266 has 4 divisors (see below), whose sum is σ = 24996402. Its totient is φ = 8332132.

The previous prime is 16664261. The next prime is 16664317. The reversal of 16664266 is 66246661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 4906225 = 3429^2 + 2215^2 .

It is a super-2 number, since 2×16664266² = 555395522637512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16664261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166065 + ... + 4166068.

Almost surely, 2^16664266 is an apocalyptic number.

16664266 is a deficient number, since it is larger than the sum of its proper divisors (8332136).

16664266 is an equidigital number, since it uses as much as digits as its factorization.

16664266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8332135.

The product of its digits is 62208, while the sum is 37.

The square root of 16664266 is about 4082.1888736314. The cubic root of 16664266 is about 255.4242125189.

The spelling of 16664266 in words is "sixteen million, six hundred sixty-four thousand, two hundred sixty-six".