12172072205526 has 32 divisors (see below), whose sum is σ = 24437447331840. Its totient is φ = 4041810378144.

The previous prime is 12172072205509. The next prime is 12172072205551. The reversal of 12172072205526 is 62550227027121.

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 15 ways as a sum of consecutive naturals, for example, 13779691 + ... + 14636393.

It is an arithmetic number, because the mean of its divisors is an integer number (763670229120).

Almost surely, 2^{12172072205526} is an apocalyptic number.

12172072205526 is an abundant number, since it is smaller than the sum of its proper divisors (12265375126314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12172072205526 is a wasteful number, since it uses less digits than its factorization.

12172072205526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865780.

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 12172072205526 in words is "twelve trillion, one hundred seventy-two billion, seventy-two million, two hundred five thousand, five hundred twenty-six".