12555198251209 has 2 divisors, whose sum is σ = 12555198251210. Its totient is φ = 12555198251208.

The previous prime is 12555198251093. The next prime is 12555198251249. The reversal of 12555198251209 is 90215289155521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7547091356809 + 5008106894400 = 2747197^2 + 2237880^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555198251209 - 2²⁵ = 12555164696777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12555198251209.

It is not a weakly prime, because it can be changed into another prime (12555198251249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277599125604 + 6277599125605.

It is an arithmetic number, because the mean of its divisors is an integer number (6277599125605).

Almost surely, 2^{12555198251209} is an apocalyptic number.

It is an amenable number.

12555198251209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555198251209 is an equidigital number, since it uses as much as digits as its factorization.

12555198251209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240000, while the sum is 55.

The spelling of 12555198251209 in words is "twelve trillion, five hundred fifty-five billion, one hundred ninety-eight million, two hundred fifty-one thousand, two hundred nine".