125535535521 has 16 divisors (see below), whose sum is σ = 184369935360. Its totient is φ = 75343479120.

The previous prime is 125535535513. The next prime is 125535535523.

125535535521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 125535535521 - 2³ = 125535535513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125535535523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18463141 + ... + 18469938.

It is an arithmetic number, because the mean of its divisors is an integer number (11523120960).

Almost surely, 2^125535535521 is an apocalyptic number.

125535535521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125535535521 is a deficient number, since it is larger than the sum of its proper divisors (58834399839).

125535535521 is a wasteful number, since it uses less digits than its factorization.

125535535521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36933196.

The product of its digits is 562500, while the sum is 42.

The spelling of 125535535521 in words is "one hundred twenty-five billion, five hundred thirty-five million, five hundred thirty-five thousand, five hundred twenty-one".