1312661521340 has 48 divisors (see below), whose sum is σ = 2971459716960. Its totient is φ = 484213766400.

The previous prime is 1312661521331. The next prime is 1312661521343. The reversal of 1312661521340 is 431251662131.

It is a self number, because there is not a number n which added to its sum of digits gives 1312661521340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312661521343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2128595 + ... + 2675114.

It is an arithmetic number, because the mean of its divisors is an integer number (61905410770).

Almost surely, 2^{1312661521340} is an apocalyptic number.

1312661521340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312661521340 is an abundant number, since it is smaller than the sum of its proper divisors (1658798195620).

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

1312661521340 is a wasteful number, since it uses less digits than its factorization.

1312661521340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4804782 (or 4804780 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 1312661521340 in words is "one trillion, three hundred twelve billion, six hundred sixty-one million, five hundred twenty-one thousand, three hundred forty".