664376266 has 4 divisors (see below), whose sum is σ = 996564402. Its totient is φ = 332188132.

The previous prime is 664376261. The next prime is 664376299. The reversal of 664376266 is 662673466.

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., 523265625 + 141110641 = 22875^2 + 11879^2 .

It is not an unprimeable number, because it can be changed into a prime (664376261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166094065 + ... + 166094068.

Almost surely, 2^664376266 is an apocalyptic number.

664376266 is a deficient number, since it is larger than the sum of its proper divisors (332188136).

664376266 is a wasteful number, since it uses less digits than its factorization.

664376266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332188135.

The product of its digits is 1306368, while the sum is 46.

The square root of 664376266 is about 25775.4973957827. The cubic root of 664376266 is about 872.5788922185.

The spelling of 664376266 in words is "six hundred sixty-four million, three hundred seventy-six thousand, two hundred sixty-six".