125539935521 has 32 divisors (see below), whose sum is σ = 168593875968. Its totient is φ = 90278763840.

The previous prime is 125539935517. The next prime is 125539935539.

125539935521 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 125539935521 - 2² = 125539935517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125539935521.

It is not an unprimeable number, because it can be changed into a prime (125539935421) 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, 5822066 + ... + 5843588.

It is an arithmetic number, because the mean of its divisors is an integer number (5268558624).

Almost surely, 2^125539935521 is an apocalyptic number.

125539935521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125539935521 is a deficient number, since it is larger than the sum of its proper divisors (43053940447).

125539935521 is a wasteful number, since it uses less digits than its factorization.

125539935521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27381.

The product of its digits is 1822500, while the sum is 50.

The spelling of 125539935521 in words is "one hundred twenty-five billion, five hundred thirty-nine million, nine hundred thirty-five thousand, five hundred twenty-one".