13661215123 has 2 divisors, whose sum is σ = 13661215124. Its totient is φ = 13661215122.

The previous prime is 13661215081. The next prime is 13661215157. The reversal of 13661215123 is 32151216631.

13661215123 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 is a cyclic number.

It is not a de Polignac number, because 13661215123 - 2²⁵ = 13627660691 is a prime.

It is not a weakly prime, because it can be changed into another prime (13661219123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830607561 + 6830607562.

It is an arithmetic number, because the mean of its divisors is an integer number (6830607562).

Almost surely, 2^13661215123 is an apocalyptic number.

13661215123 is a deficient number, since it is larger than the sum of its proper divisors (1).

13661215123 is an equidigital number, since it uses as much as digits as its factorization.

13661215123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The spelling of 13661215123 in words is "thirteen billion, six hundred sixty-one million, two hundred fifteen thousand, one hundred twenty-three".