16688175326609 has 2 divisors, whose sum is σ = 16688175326610. Its totient is φ = 16688175326608.

The previous prime is 16688175326549. The next prime is 16688175326621. The reversal of 16688175326609 is 90662357188661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14477050936384 + 2211124390225 = 3804872^2 + 1486985^2 .

It is a cyclic number.

It is not a de Polignac number, because 16688175326609 - 2⁸ = 16688175326353 is a prime.

It is not a weakly prime, because it can be changed into another prime (16688175326689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344087663304 + 8344087663305.

It is an arithmetic number, because the mean of its divisors is an integer number (8344087663305).

Almost surely, 2^{16688175326609} is an apocalyptic number.

It is an amenable number.

16688175326609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16688175326609 is an equidigital number, since it uses as much as digits as its factorization.

16688175326609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156764160, while the sum is 68.

The spelling of 16688175326609 in words is "sixteen trillion, six hundred eighty-eight billion, one hundred seventy-five million, three hundred twenty-six thousand, six hundred nine".