12540636413 has 2 divisors, whose sum is σ = 12540636414. Its totient is φ = 12540636412.

The previous prime is 12540636391. The next prime is 12540636457. The reversal of 12540636413 is 31463604521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12051209284 + 489427129 = 109778^2 + 22123^2 .

It is an emirp because it is prime and its reverse (31463604521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12540636413 - 2¹² = 12540632317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12540636113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270318206 + 6270318207.

It is an arithmetic number, because the mean of its divisors is an integer number (6270318207).

Almost surely, 2^12540636413 is an apocalyptic number.

It is an amenable number.

12540636413 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540636413 is an equidigital number, since it uses as much as digits as its factorization.

12540636413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 12540636413 in words is "twelve billion, five hundred forty million, six hundred thirty-six thousand, four hundred thirteen".