16505660671 has 2 divisors, whose sum is σ = 16505660672. Its totient is φ = 16505660670.

The previous prime is 16505660659. The next prime is 16505660719. The reversal of 16505660671 is 17606650561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16505660671 - 2⁹ = 16505660159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16505660641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252830335 + 8252830336.

It is an arithmetic number, because the mean of its divisors is an integer number (8252830336).

Almost surely, 2^16505660671 is an apocalyptic number.

16505660671 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505660671 is an equidigital number, since it uses as much as digits as its factorization.

16505660671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 16505660671 in words is "sixteen billion, five hundred five million, six hundred sixty thousand, six hundred seventy-one".