1311884666 has 16 divisors (see below), whose sum is σ = 2008863240. Its totient is φ = 642358080.

The previous prime is 1311884663. The next prime is 1311884669. The reversal of 1311884666 is 6664881131.

It is an interprime number because it is at equal distance from previous prime (1311884663) and next prime (1311884669).

It can be written as a sum of positive squares in 4 ways, for example, as 949934041 + 361950625 = 30821^2 + 19025^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311884663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4460 + ... + 51416.

Almost surely, 2^1311884666 is an apocalyptic number.

1311884666 is a deficient number, since it is larger than the sum of its proper divisors (696978574).

1311884666 is a wasteful number, since it uses less digits than its factorization.

1311884666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47249.

The product of its digits is 165888, while the sum is 44.

The square root of 1311884666 is about 36219.9484538562. The cubic root of 1311884666 is about 1094.7086555573.

The spelling of 1311884666 in words is "one billion, three hundred eleven million, eight hundred eighty-four thousand, six hundred sixty-six".