12154466512109 has 2 divisors, whose sum is σ = 12154466512110. Its totient is φ = 12154466512108.

The previous prime is 12154466512051. The next prime is 12154466512159. The reversal of 12154466512109 is 90121566445121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7190495880100 + 4963970632009 = 2681510^2 + 2227997^2 .

It is an emirp because it is prime and its reverse (90121566445121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12154466512109 - 2¹² = 12154466508013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12154466512159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077233256054 + 6077233256055.

It is an arithmetic number, because the mean of its divisors is an integer number (6077233256055).

Almost surely, 2^{12154466512109} is an apocalyptic number.

It is an amenable number.

12154466512109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154466512109 is an equidigital number, since it uses as much as digits as its factorization.

12154466512109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 12154466512109 in words is "twelve trillion, one hundred fifty-four billion, four hundred sixty-six million, five hundred twelve thousand, one hundred nine".