12720380662361 has 4 divisors (see below), whose sum is σ = 12720418650852. Its totient is φ = 12720342673872.

The previous prime is 12720380662351. The next prime is 12720380662427. The reversal of 12720380662361 is 16326608302721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5050555054336 + 7669825608025 = 2247344^2 + 2769445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12720380662361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720380662351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18487466 + ... + 19163171.

It is an arithmetic number, because the mean of its divisors is an integer number (3180104662713).

Almost surely, 2^{12720380662361} is an apocalyptic number.

It is an amenable number.

12720380662361 is a deficient number, since it is larger than the sum of its proper divisors (37988491).

12720380662361 is an equidigital number, since it uses as much as digits as its factorization.

12720380662361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37988490.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 12720380662361 in words is "twelve trillion, seven hundred twenty billion, three hundred eighty million, six hundred sixty-two thousand, three hundred sixty-one".