125951673721 has 16 divisors (see below), whose sum is σ = 138361420800. Its totient is φ = 114121223568.

The previous prime is 125951673719. The next prime is 125951673733. The reversal of 125951673721 is 127376159521.

It is a cyclic number.

It is not a de Polignac number, because 125951673721 - 2¹ = 125951673719 is a prime.

It is a super-2 number, since 2×125951673721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125951673791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6942300 + ... + 6960418.

It is an arithmetic number, because the mean of its divisors is an integer number (8647588800).

Almost surely, 2^125951673721 is an apocalyptic number.

It is an amenable number.

125951673721 is a deficient number, since it is larger than the sum of its proper divisors (12409747079).

125951673721 is a wasteful number, since it uses less digits than its factorization.

125951673721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34068.

The product of its digits is 793800, while the sum is 49.

The spelling of 125951673721 in words is "one hundred twenty-five billion, nine hundred fifty-one million, six hundred seventy-three thousand, seven hundred twenty-one".