2564166266 has 4 divisors (see below), whose sum is σ = 3846249402. Its totient is φ = 1282083132.

The previous prime is 2564166217. The next prime is 2564166277. The reversal of 2564166266 is 6626614652.

It is a happy number.

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., 1789713025 + 774453241 = 42305^2 + 27829^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641041565 + ... + 641041568.

Almost surely, 2^2564166266 is an apocalyptic number.

2564166266 is a deficient number, since it is larger than the sum of its proper divisors (1282083136).

2564166266 is a wasteful number, since it uses less digits than its factorization.

2564166266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282083135.

The product of its digits is 622080, while the sum is 44.

The square root of 2564166266 is about 50637.5973561148. The cubic root of 2564166266 is about 1368.7224608180.

The spelling of 2564166266 in words is "two billion, five hundred sixty-four million, one hundred sixty-six thousand, two hundred sixty-six".