16938679787 has 2 divisors, whose sum is σ = 16938679788. Its totient is φ = 16938679786.

The previous prime is 16938679783. The next prime is 16938679817. The reversal of 16938679787 is 78797683961.

It is a weak prime.

It is an emirp because it is prime and its reverse (78797683961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16938679787 - 2² = 16938679783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16938679787.

It is not a weakly prime, because it can be changed into another prime (16938679781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469339893 + 8469339894.

It is an arithmetic number, because the mean of its divisors is an integer number (8469339894).

Almost surely, 2^16938679787 is an apocalyptic number.

16938679787 is a deficient number, since it is larger than the sum of its proper divisors (1).

16938679787 is an equidigital number, since it uses as much as digits as its factorization.

16938679787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192036096, while the sum is 71.

The spelling of 16938679787 in words is "sixteen billion, nine hundred thirty-eight million, six hundred seventy-nine thousand, seven hundred eighty-seven".