1311432505866 has 48 divisors (see below), whose sum is σ = 3249216045504. Its totient is φ = 374480459712.

The previous prime is 1311432505849. The next prime is 1311432505907. The reversal of 1311432505866 is 6685052341131.

1311432505866 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 43 + 25 + 0 + 586 + 6 = 666.

It is a super-2 number, since 2×1311432505866² (a number of 25 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 2758755 + ... + 3198998.

It is an arithmetic number, because the mean of its divisors is an integer number (67692000948).

Almost surely, 2^{1311432505866} is an apocalyptic number.

1311432505866 is an abundant number, since it is smaller than the sum of its proper divisors (1937783539638).

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

1311432505866 is a wasteful number, since it uses less digits than its factorization.

1311432505866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5959515 (or 5959512 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

Adding to 1311432505866 its reverse (6685052341131), we get a palindrome (7996484846997).

The spelling of 1311432505866 in words is "one trillion, three hundred eleven billion, four hundred thirty-two million, five hundred five thousand, eight hundred sixty-six".