16938679817 has 2 divisors, whose sum is σ = 16938679818. Its totient is φ = 16938679816.

The previous prime is 16938679787. The next prime is 16938679931. The reversal of 16938679817 is 71897683961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9283129801 + 7655550016 = 96349^2 + 87496^2 .

It is a cyclic number.

It is not a de Polignac number, because 16938679817 - 2¹⁰ = 16938678793 is a prime.

It is not a weakly prime, because it can be changed into another prime (16938676817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469339908 + 8469339909.

It is an arithmetic number, because the mean of its divisors is an integer number (8469339909).

Almost surely, 2^16938679817 is an apocalyptic number.

It is an amenable number.

16938679817 is a deficient number, since it is larger than the sum of its proper divisors (1).

16938679817 is an equidigital number, since it uses as much as digits as its factorization.

16938679817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 65.

The spelling of 16938679817 in words is "sixteen billion, nine hundred thirty-eight million, six hundred seventy-nine thousand, eight hundred seventeen".