16505501611 has 2 divisors, whose sum is σ = 16505501612. Its totient is φ = 16505501610.

The previous prime is 16505501591. The next prime is 16505501629. The reversal of 16505501611 is 11610550561.

It is a strong prime.

It is an emirp because it is prime and its reverse (11610550561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16505501611 - 2¹³ = 16505493419 is a prime.

It is not a weakly prime, because it can be changed into another prime (16505501681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252750805 + 8252750806.

It is an arithmetic number, because the mean of its divisors is an integer number (8252750806).

Almost surely, 2^16505501611 is an apocalyptic number.

16505501611 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505501611 is an equidigital number, since it uses as much as digits as its factorization.

16505501611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 16505501611 in words is "sixteen billion, five hundred five million, five hundred one thousand, six hundred eleven".