125366988749209 has 2 divisors, whose sum is σ = 125366988749210. Its totient is φ = 125366988749208.

The previous prime is 125366988749179. The next prime is 125366988749227. The reversal of 125366988749209 is 902947889663521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84591063075600 + 40775925673609 = 9197340^2 + 6385603^2 .

It is a cyclic number.

It is not a de Polignac number, because 125366988749209 - 2⁹ = 125366988748697 is a prime.

It is not a weakly prime, because it can be changed into another prime (125366988749239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62683494374604 + 62683494374605.

It is an arithmetic number, because the mean of its divisors is an integer number (62683494374605).

It is a 1-persistent number, because it is pandigital, but 2⋅125366988749209 = 250733977498418 is not.

Almost surely, 2^{125366988749209} is an apocalyptic number.

It is an amenable number.

125366988749209 is a deficient number, since it is larger than the sum of its proper divisors (1).

125366988749209 is an equidigital number, since it uses as much as digits as its factorization.

125366988749209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2821754880, while the sum is 79.

The spelling of 125366988749209 in words is "one hundred twenty-five trillion, three hundred sixty-six billion, nine hundred eighty-eight million, seven hundred forty-nine thousand, two hundred nine".