125599995521 has 16 divisors (see below), whose sum is σ = 168637757568. Its totient is φ = 90341654400.

The previous prime is 125599995517. The next prime is 125599995553.

125599995521 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 125599995521 - 2² = 125599995517 is a prime.

It is a super-2 number, since 2×125599995521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125599991521) 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, 62736260 + ... + 62738261.

It is an arithmetic number, because the mean of its divisors is an integer number (10539859848).

Almost surely, 2^125599995521 is an apocalyptic number.

125599995521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125599995521 is a deficient number, since it is larger than the sum of its proper divisors (43037762047).

125599995521 is a wasteful number, since it uses less digits than its factorization.

125599995521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125474552.

The product of its digits is 16402500, while the sum is 62.

The spelling of 125599995521 in words is "one hundred twenty-five billion, five hundred ninety-nine million, nine hundred ninety-five thousand, five hundred twenty-one".