125366045509 has 2 divisors, whose sum is σ = 125366045510. Its totient is φ = 125366045508.

The previous prime is 125366045449. The next prime is 125366045549. The reversal of 125366045509 is 905540663521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81312233409 + 44053812100 = 285153^2 + 209890^2 .

It is a cyclic number.

It is not a de Polignac number, because 125366045509 - 2⁹ = 125366044997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125366045549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62683022754 + 62683022755.

It is an arithmetic number, because the mean of its divisors is an integer number (62683022755).

Almost surely, 2^125366045509 is an apocalyptic number.

It is an amenable number.

125366045509 is a deficient number, since it is larger than the sum of its proper divisors (1).

125366045509 is an equidigital number, since it uses as much as digits as its factorization.

125366045509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 125366045509 in words is "one hundred twenty-five billion, three hundred sixty-six million, forty-five thousand, five hundred nine".