1311423436640 has 96 divisors (see below), whose sum is σ = 3126135720960. Its totient is φ = 519863445504.

The previous prime is 1311423436633. The next prime is 1311423436657. The reversal of 1311423436640 is 466343241131.

It is a junction number, because it is equal to n+sod(n) for n = 1311423436594 and 1311423436603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9552806 + ... + 9689114.

It is an arithmetic number, because the mean of its divisors is an integer number (32563913760).

Almost surely, 2^{1311423436640} is an apocalyptic number.

1311423436640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311423436640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1563067860480).

1311423436640 is an abundant number, since it is smaller than the sum of its proper divisors (1814712284320).

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

1311423436640 is a wasteful number, since it uses less digits than its factorization.

1311423436640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136864 (or 136856 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

Adding to 1311423436640 its reverse (466343241131), we get a palindrome (1777766677771).

The spelling of 1311423436640 in words is "one trillion, three hundred eleven billion, four hundred twenty-three million, four hundred thirty-six thousand, six hundred forty".