125565345289 has 4 divisors (see below), whose sum is σ = 125768197840. Its totient is φ = 125362492740.

The previous prime is 125565345271. The next prime is 125565345307. The reversal of 125565345289 is 982543565521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982543565521 = 7 ⋅140363366503.

It is an interprime number because it is at equal distance from previous prime (125565345271) and next prime (125565345307).

It is a cyclic number.

It is not a de Polignac number, because 125565345289 - 2⁹ = 125565344777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125565342289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101425347 + ... + 101426584.

It is an arithmetic number, because the mean of its divisors is an integer number (31442049460).

Almost surely, 2^125565345289 is an apocalyptic number.

It is an amenable number.

125565345289 is a deficient number, since it is larger than the sum of its proper divisors (202852551).

125565345289 is an equidigital number, since it uses as much as digits as its factorization.

125565345289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202852550.

The product of its digits is 12960000, while the sum is 55.

The spelling of 125565345289 in words is "one hundred twenty-five billion, five hundred sixty-five million, three hundred forty-five thousand, two hundred eighty-nine".