11615531666393 has 2 divisors, whose sum is σ = 11615531666394. Its totient is φ = 11615531666392.

The previous prime is 11615531666287. The next prime is 11615531666399. The reversal of 11615531666393 is 39366613551611.

11615531666393 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., 11576577538969 + 38954127424 = 3402437^2 + 197368^2 .

It is a cyclic number.

It is not a de Polignac number, because 11615531666393 - 2⁴⁰ = 10516020038617 is a prime.

It is not a weakly prime, because it can be changed into another prime (11615531666399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5807765833196 + 5807765833197.

It is an arithmetic number, because the mean of its divisors is an integer number (5807765833197).

Almost surely, 2^{11615531666393} is an apocalyptic number.

It is an amenable number.

11615531666393 is a deficient number, since it is larger than the sum of its proper divisors (1).

11615531666393 is an equidigital number, since it uses as much as digits as its factorization.

11615531666393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7873200, while the sum is 56.

The spelling of 11615531666393 in words is "eleven trillion, six hundred fifteen billion, five hundred thirty-one million, six hundred sixty-six thousand, three hundred ninety-three".