125565436573 has 4 divisors (see below), whose sum is σ = 126523951488. Its totient is φ = 124606921660.

The previous prime is 125565436559. The next prime is 125565436583. The reversal of 125565436573 is 375634565521.

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.

It is a cyclic number.

It is not a de Polignac number, because 125565436573 - 2⁵ = 125565436541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125565436573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125565436583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479257261 + ... + 479257522.

It is an arithmetic number, because the mean of its divisors is an integer number (31630987872).

Almost surely, 2^125565436573 is an apocalyptic number.

It is an amenable number.

125565436573 is a deficient number, since it is larger than the sum of its proper divisors (958514915).

125565436573 is an equidigital number, since it uses as much as digits as its factorization.

125565436573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958514914.

The product of its digits is 11340000, while the sum is 52.

The spelling of 125565436573 in words is "one hundred twenty-five billion, five hundred sixty-five million, four hundred thirty-six thousand, five hundred seventy-three".