12520344738401 has 4 divisors (see below), whose sum is σ = 12786735052032. Its totient is φ = 12253954424772.

The previous prime is 12520344738379. The next prime is 12520344738449. The reversal of 12520344738401 is 10483744302521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12520344738401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12520344738101) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 133195156745 + ... + 133195156838.

It is an arithmetic number, because the mean of its divisors is an integer number (3196683763008).

Almost surely, 2^{12520344738401} is an apocalyptic number.

It is an amenable number.

12520344738401 is a deficient number, since it is larger than the sum of its proper divisors (266390313631).

12520344738401 is an equidigital number, since it uses as much as digits as its factorization.

12520344738401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266390313630.

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 12520344738401 in words is "twelve trillion, five hundred twenty billion, three hundred forty-four million, seven hundred thirty-eight thousand, four hundred one".