12154376235217 has 2 divisors, whose sum is σ = 12154376235218. Its totient is φ = 12154376235216.

The previous prime is 12154376235191. The next prime is 12154376235247. The reversal of 12154376235217 is 71253267345121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11757773539521 + 396602695696 = 3428961^2 + 629764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12154376235217 is a prime.

It is a super-2 number, since 2×12154376235217² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12154376235247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077188117608 + 6077188117609.

It is an arithmetic number, because the mean of its divisors is an integer number (6077188117609).

Almost surely, 2^{12154376235217} is an apocalyptic number.

It is an amenable number.

12154376235217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154376235217 is an equidigital number, since it uses as much as digits as its factorization.

12154376235217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 49.

The spelling of 12154376235217 in words is "twelve trillion, one hundred fifty-four billion, three hundred seventy-six million, two hundred thirty-five thousand, two hundred seventeen".