16778849237 has 2 divisors, whose sum is σ = 16778849238. Its totient is φ = 16778849236.

The previous prime is 16778849179. The next prime is 16778849239. The reversal of 16778849237 is 73294887761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10372607716 + 6406241521 = 101846^2 + 80039^2 .

It is a cyclic number.

It is not a de Polignac number, because 16778849237 - 2¹⁰ = 16778848213 is a prime.

Together with 16778849239, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16778849237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16778849239) 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, 8389424618 + 8389424619.

It is an arithmetic number, because the mean of its divisors is an integer number (8389424619).

Almost surely, 2^16778849237 is an apocalyptic number.

It is an amenable number.

16778849237 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778849237 is an equidigital number, since it uses as much as digits as its factorization.

16778849237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 62.

The spelling of 16778849237 in words is "sixteen billion, seven hundred seventy-eight million, eight hundred forty-nine thousand, two hundred thirty-seven".