16555434125 has 16 divisors (see below), whose sum is σ = 20792806320. Its totient is φ = 13159972800.

The previous prime is 16555434121. The next prime is 16555434127. The reversal of 16555434125 is 52143455561.

It can be written as a sum of positive squares in 8 ways, for example, as 8691646441 + 7863787684 = 93229^2 + 88678^2 .

It is not a de Polignac number, because 16555434125 - 2² = 16555434121 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555434121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402170 + ... + 441419.

It is an arithmetic number, because the mean of its divisors is an integer number (1299550395).

Almost surely, 2^16555434125 is an apocalyptic number.

It is an amenable number.

16555434125 is a deficient number, since it is larger than the sum of its proper divisors (4237372195).

16555434125 is an equidigital number, since it uses as much as digits as its factorization.

16555434125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843761 (or 843751 counting only the distinct ones).

The product of its digits is 360000, while the sum is 41.

Adding to 16555434125 its reverse (52143455561), we get a palindrome (68698889686).

The spelling of 16555434125 in words is "sixteen billion, five hundred fifty-five million, four hundred thirty-four thousand, one hundred twenty-five".