17688672149 has 2 divisors, whose sum is σ = 17688672150. Its totient is φ = 17688672148.

The previous prime is 17688672101. The next prime is 17688672173. The reversal of 17688672149 is 94127688671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17671714225 + 16957924 = 132935^2 + 4118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17688672149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17688672179) 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 as a sum of consecutive naturals, namely, 8844336074 + 8844336075.

It is an arithmetic number, because the mean of its divisors is an integer number (8844336075).

Almost surely, 2^17688672149 is an apocalyptic number.

It is an amenable number.

17688672149 is a deficient number, since it is larger than the sum of its proper divisors (1).

17688672149 is an equidigital number, since it uses as much as digits as its factorization.

17688672149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 59.

The spelling of 17688672149 in words is "seventeen billion, six hundred eighty-eight million, six hundred seventy-two thousand, one hundred forty-nine".