125559551243 has 4 divisors (see below), whose sum is σ = 143496630000. Its totient is φ = 107622472488.

The previous prime is 125559551237. The next prime is 125559551287. The reversal of 125559551243 is 342155955521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125559551243 - 2⁶ = 125559551179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125559551203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8968539368 + ... + 8968539381.

It is an arithmetic number, because the mean of its divisors is an integer number (35874157500).

Almost surely, 2^125559551243 is an apocalyptic number.

125559551243 is a deficient number, since it is larger than the sum of its proper divisors (17937078757).

125559551243 is an equidigital number, since it uses as much as digits as its factorization.

125559551243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17937078756.

The product of its digits is 1350000, while the sum is 47.

The spelling of 125559551243 in words is "one hundred twenty-five billion, five hundred fifty-nine million, five hundred fifty-one thousand, two hundred forty-three".