12500518109 has 2 divisors, whose sum is σ = 12500518110. Its totient is φ = 12500518108.

The previous prime is 12500518091. The next prime is 12500518123. The reversal of 12500518109 is 90181500521.

Together with previous prime (12500518091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10428902884 + 2071615225 = 102122^2 + 45515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12500518109 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 (12500518139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250259054 + 6250259055.

It is an arithmetic number, because the mean of its divisors is an integer number (6250259055).

Almost surely, 2^12500518109 is an apocalyptic number.

It is an amenable number.

12500518109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12500518109 is an equidigital number, since it uses as much as digits as its factorization.

12500518109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 32.

The spelling of 12500518109 in words is "twelve billion, five hundred million, five hundred eighteen thousand, one hundred nine".