66644266 has 16 divisors (see below), whose sum is σ = 108509184. Its totient is φ = 30515184.

The previous prime is 66644239. The next prime is 66644299. The reversal of 66644266 is 66244666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6790 + ... + 13393.

It is an arithmetic number, because the mean of its divisors is an integer number (6781824).

Almost surely, 2^66644266 is an apocalyptic number.

66644266 is a deficient number, since it is larger than the sum of its proper divisors (41864918).

66644266 is a wasteful number, since it uses less digits than its factorization.

66644266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20325.

The product of its digits is 248832, while the sum is 40.

The square root of 66644266 is about 8163.5939389463. The cubic root of 66644266 is about 405.4347128241.

The spelling of 66644266 in words is "sixty-six million, six hundred forty-four thousand, two hundred sixty-six".