1311231553166 has 16 divisors (see below), whose sum is σ = 1969015319856. Its totient is φ = 654893510976.

The previous prime is 1311231553123. The next prime is 1311231553207. The reversal of 1311231553166 is 6613551321131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6619880 + ... + 6815076.

It is an arithmetic number, because the mean of its divisors is an integer number (123063457491).

Almost surely, 2^{1311231553166} is an apocalyptic number.

1311231553166 is a deficient number, since it is larger than the sum of its proper divisors (657783766690).

1311231553166 is a wasteful number, since it uses less digits than its factorization.

1311231553166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198883.

The product of its digits is 48600, while the sum is 38.

Adding to 1311231553166 its reverse (6613551321131), we get a palindrome (7924782874297).

The spelling of 1311231553166 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, five hundred fifty-three thousand, one hundred sixty-six".