12155566013 has 2 divisors, whose sum is σ = 12155566014. Its totient is φ = 12155566012.

The previous prime is 12155566009. The next prime is 12155566091. The reversal of 12155566013 is 31066555121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6564564484 + 5591001529 = 81022^2 + 74773^2 .

It is a cyclic number.

It is not a de Polignac number, because 12155566013 - 2² = 12155566009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12155566513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077783006 + 6077783007.

It is an arithmetic number, because the mean of its divisors is an integer number (6077783007).

Almost surely, 2^12155566013 is an apocalyptic number.

It is an amenable number.

12155566013 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155566013 is an equidigital number, since it uses as much as digits as its factorization.

12155566013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 12155566013 in words is "twelve billion, one hundred fifty-five million, five hundred sixty-six thousand, thirteen".