66744266 has 8 divisors (see below), whose sum is σ = 100250244. Its totient is φ = 33327520.

The previous prime is 66744259. The next prime is 66744289. The reversal of 66744266 is 66244766.

It can be written as a sum of positive squares in 2 ways, for example, as 47128225 + 19616041 = 6865^2 + 4429^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20405 + ... + 23448.

Almost surely, 2^66744266 is an apocalyptic number.

66744266 is a deficient number, since it is larger than the sum of its proper divisors (33505978).

66744266 is a wasteful number, since it uses less digits than its factorization.

66744266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44616.

The product of its digits is 290304, while the sum is 41.

The square root of 66744266 is about 8169.7163965465. The cubic root of 66744266 is about 405.6373969761.

Subtracting from 66744266 its reverse (66244766), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 66744266 in words is "sixty-six million, seven hundred forty-four thousand, two hundred sixty-six".