11987309656213 has 2 divisors, whose sum is σ = 11987309656214. Its totient is φ = 11987309656212.

The previous prime is 11987309656171. The next prime is 11987309656237. The reversal of 11987309656213 is 31265690378911.

It is a happy number.

11987309656213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11330110836529 + 657198819684 = 3366023^2 + 810678^2 .

It is a cyclic number.

It is not a de Polignac number, because 11987309656213 - 2²⁹ = 11986772785301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11987309656313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993654828106 + 5993654828107.

It is an arithmetic number, because the mean of its divisors is an integer number (5993654828107).

Almost surely, 2^{11987309656213} is an apocalyptic number.

It is an amenable number.

11987309656213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987309656213 is an equidigital number, since it uses as much as digits as its factorization.

11987309656213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 11987309656213 in words is "eleven trillion, nine hundred eighty-seven billion, three hundred nine million, six hundred fifty-six thousand, two hundred thirteen".