17943864749 has 2 divisors, whose sum is σ = 17943864750. Its totient is φ = 17943864748.

The previous prime is 17943864709. The next prime is 17943864793. The reversal of 17943864749 is 94746834971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15108834724 + 2835030025 = 122918^2 + 53245^2 .

It is a cyclic number.

It is not a de Polignac number, because 17943864749 - 2²⁰ = 17942816173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17943864691 and 17943864700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17943864709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8971932374 + 8971932375.

It is an arithmetic number, because the mean of its divisors is an integer number (8971932375).

Almost surely, 2^17943864749 is an apocalyptic number.

It is an amenable number.

17943864749 is a deficient number, since it is larger than the sum of its proper divisors (1).

17943864749 is an equidigital number, since it uses as much as digits as its factorization.

17943864749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36578304, while the sum is 62.

The spelling of 17943864749 in words is "seventeen billion, nine hundred forty-three million, eight hundred sixty-four thousand, seven hundred forty-nine".