16505510051 has 4 divisors (see below), whose sum is σ = 17074665600. Its totient is φ = 15936354504.

The previous prime is 16505510039. The next prime is 16505510071. The reversal of 16505510051 is 15001550561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16505510051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 569155519 = 16505510051 / (1 + 6 + 5 + 0 + 5 + 5 + 1 + 0 + 0 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16505509996 and 16505510023.

It is not an unprimeable number, because it can be changed into a prime (16505510071) 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 3 ways as a sum of consecutive naturals, for example, 284577731 + ... + 284577788.

It is an arithmetic number, because the mean of its divisors is an integer number (4268666400).

Almost surely, 2^16505510051 is an apocalyptic number.

16505510051 is a deficient number, since it is larger than the sum of its proper divisors (569155549).

16505510051 is an equidigital number, since it uses as much as digits as its factorization.

16505510051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569155548.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 16505510051 in words is "sixteen billion, five hundred five million, five hundred ten thousand, fifty-one".