125710017521 has 32 divisors (see below), whose sum is σ = 147386843136. Its totient is φ = 105954336000.

The previous prime is 125710017491. The next prime is 125710017581.

125710017521 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-125710017521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125710017581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3661766 + ... + 3695936.

It is an arithmetic number, because the mean of its divisors is an integer number (4605838848).

Almost surely, 2^125710017521 is an apocalyptic number.

125710017521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125710017521 is a deficient number, since it is larger than the sum of its proper divisors (21676825615).

125710017521 is a wasteful number, since it uses less digits than its factorization.

125710017521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34493.

The product of its (nonzero) digits is 4900, while the sum is 32.

The spelling of 125710017521 in words is "one hundred twenty-five billion, seven hundred ten million, seventeen thousand, five hundred twenty-one".