16688702216677 has 2 divisors, whose sum is σ = 16688702216678. Its totient is φ = 16688702216676.

The previous prime is 16688702216663. The next prime is 16688702216689. The reversal of 16688702216677 is 77661220788661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14182160978241 + 2506541238436 = 3765921^2 + 1583206^2 .

It is a cyclic number.

It is not a de Polignac number, because 16688702216677 - 2¹⁹ = 16688701692389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16688702246677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344351108338 + 8344351108339.

It is an arithmetic number, because the mean of its divisors is an integer number (8344351108339).

Almost surely, 2^{16688702216677} is an apocalyptic number.

It is an amenable number.

16688702216677 is a deficient number, since it is larger than the sum of its proper divisors (1).

16688702216677 is an equidigital number, since it uses as much as digits as its factorization.

16688702216677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113799168, while the sum is 67.

The spelling of 16688702216677 in words is "sixteen trillion, six hundred eighty-eight billion, seven hundred two million, two hundred sixteen thousand, six hundred seventy-seven".