12172072205525 has 24 divisors (see below), whose sum is σ = 15769615781184. Its totient is φ = 9302445820800.

The previous prime is 12172072205509. The next prime is 12172072205551. The reversal of 12172072205525 is 52550227027121.

It is not a de Polignac number, because 12172072205525 - 2⁴ = 12172072205509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12996536 + ... + 13901585.

It is an arithmetic number, because the mean of its divisors is an integer number (657067324216).

Almost surely, 2^{12172072205525} is an apocalyptic number.

It is an amenable number.

12172072205525 is a deficient number, since it is larger than the sum of its proper divisors (3597543575659).

12172072205525 is a wasteful number, since it uses less digits than its factorization.

12172072205525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26898941 (or 26898936 counting only the distinct ones).

The product of its (nonzero) digits is 196000, while the sum is 41.

The spelling of 12172072205525 in words is "twelve trillion, one hundred seventy-two billion, seventy-two million, two hundred five thousand, five hundred twenty-five".