16505550113 has 24 divisors (see below), whose sum is σ = 18803921976. Its totient is φ = 14462323200.

The previous prime is 16505550049. The next prime is 16505550151. The reversal of 16505550113 is 31105550561.

It can be written as a sum of positive squares in 12 ways, for example, as 6984279184 + 9521270929 = 83572^2 + 97577^2 .

It is not a de Polignac number, because 16505550113 - 2⁶ = 16505550049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16505550113.

It is not an unprimeable number, because it can be changed into a prime (16505550613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224183 + ... + 288563.

It is an arithmetic number, because the mean of its divisors is an integer number (783496749).

Almost surely, 2^16505550113 is an apocalyptic number.

16505550113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16505550113 is a deficient number, since it is larger than the sum of its proper divisors (2298371863).

16505550113 is a wasteful number, since it uses less digits than its factorization.

16505550113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64485 (or 64472 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 32.

The spelling of 16505550113 in words is "sixteen billion, five hundred five million, five hundred fifty thousand, one hundred thirteen".