16555231165525 has 36 divisors (see below), whose sum is σ = 22243968675468. Its totient is φ = 12217208340480.

The previous prime is 16555231165523. The next prime is 16555231165591. The reversal of 16555231165525 is 52556113255561.

It can be written as a sum of positive squares in 18 ways, for example, as 12258163359556 + 4297067805969 = 3501166^2 + 2072937^2 .

It is not a de Polignac number, because 16555231165525 - 2¹ = 16555231165523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555231165523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4995669 + ... + 7620181.

It is an arithmetic number, because the mean of its divisors is an integer number (617888018763).

Almost surely, 2^{16555231165525} is an apocalyptic number.

It is an amenable number.

16555231165525 is a deficient number, since it is larger than the sum of its proper divisors (5688737509943).

16555231165525 is a wasteful number, since it uses less digits than its factorization.

16555231165525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626042 (or 2626024 counting only the distinct ones).

The product of its digits is 6750000, while the sum is 52.

The spelling of 16555231165525 in words is "sixteen trillion, five hundred fifty-five billion, two hundred thirty-one million, one hundred sixty-five thousand, five hundred twenty-five".