16539403820125 has 8 divisors (see below), whose sum is σ = 20641175967672. Its totient is φ = 13231523056000.

The previous prime is 16539403820059. The next prime is 16539403820197. The reversal of 16539403820125 is 52102830493561.

It can be written as a sum of positive squares in 4 ways, for example, as 4871427251161 + 11667976568964 = 2207131^2 + 3415842^2 .

It is not a de Polignac number, because 16539403820125 - 2²¹ = 16539401722973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66157615156 + ... + 66157615405.

It is an arithmetic number, because the mean of its divisors is an integer number (2580146995959).

Almost surely, 2^{16539403820125} is an apocalyptic number.

It is an amenable number.

16539403820125 is a deficient number, since it is larger than the sum of its proper divisors (4101772147547).

16539403820125 is an equidigital number, since it uses as much as digits as its factorization.

16539403820125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132315230576 (or 132315230566 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 16539403820125 in words is "sixteen trillion, five hundred thirty-nine billion, four hundred three million, eight hundred twenty thousand, one hundred twenty-five".