1311101115666 has 16 divisors (see below), whose sum is σ = 2655394665600. Its totient is φ = 431501632848.

The previous prime is 1311101115661. The next prime is 1311101115683. The reversal of 1311101115666 is 6665111011131.

It is a super-2 number, since 2×1311101115666² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311101115661) 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, 1383017581 + ... + 1383018528.

It is an arithmetic number, because the mean of its divisors is an integer number (165962166600).

Almost surely, 2^{1311101115666} is an apocalyptic number.

1311101115666 is an abundant number, since it is smaller than the sum of its proper divisors (1344293549934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311101115666 is a wasteful number, since it uses less digits than its factorization.

1311101115666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766036193.

The product of its (nonzero) digits is 3240, while the sum is 33.

Adding to 1311101115666 its reverse (6665111011131), we get a palindrome (7976212126797).

The spelling of 1311101115666 in words is "one trillion, three hundred eleven billion, one hundred one million, one hundred fifteen thousand, six hundred sixty-six".