2631662666 has 16 divisors (see below), whose sum is σ = 4094335080. Its totient is φ = 1267588800.

The previous prime is 2631662639. The next prime is 2631662687. The reversal of 2631662666 is 6662661362.

It can be written as a sum of positive squares in 4 ways, for example, as 2592337225 + 39325441 = 50915^2 + 6271^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168581 + ... + 183528.

Almost surely, 2^2631662666 is an apocalyptic number.

2631662666 is a deficient number, since it is larger than the sum of its proper divisors (1462672414).

2631662666 is a wasteful number, since it uses less digits than its factorization.

2631662666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352249.

The product of its digits is 559872, while the sum is 44.

The square root of 2631662666 is about 51299.7335860529. The cubic root of 2631662666 is about 1380.6281999514.

The spelling of 2631662666 in words is "two billion, six hundred thirty-one million, six hundred sixty-two thousand, six hundred sixty-six".