16535081173 has 16 divisors (see below), whose sum is σ = 17940449520. Its totient is φ = 15239235648.

The previous prime is 16535081159. The next prime is 16535081191. The reversal of 16535081173 is 37118053561.

16535081173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 9309741169 + 7225340004 = 96487^2 + 85002^2 .

It is not a de Polignac number, because 16535081173 - 2²¹ = 16532984021 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 (16535081473) by changing a digit.

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, 1481811 + ... + 1492927.

It is an arithmetic number, because the mean of its divisors is an integer number (1121278095).

Almost surely, 2^16535081173 is an apocalyptic number.

16535081173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16535081173 is a deficient number, since it is larger than the sum of its proper divisors (1405368347).

16535081173 is an equidigital number, since it uses as much as digits as its factorization.

16535081173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11833 (or 11807 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 16535081173 in words is "sixteen billion, five hundred thirty-five million, eighty-one thousand, one hundred seventy-three".