17991354559 has 2 divisors, whose sum is σ = 17991354560. Its totient is φ = 17991354558.

The previous prime is 17991354509. The next prime is 17991354629. The reversal of 17991354559 is 95545319971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17991354559 - 2⁷ = 17991354431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17991354509) 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, 8995677279 + 8995677280.

It is an arithmetic number, because the mean of its divisors is an integer number (8995677280).

Almost surely, 2^17991354559 is an apocalyptic number.

17991354559 is a deficient number, since it is larger than the sum of its proper divisors (1).

17991354559 is an equidigital number, since it uses as much as digits as its factorization.

17991354559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7654500, while the sum is 58.

The spelling of 17991354559 in words is "seventeen billion, nine hundred ninety-one million, three hundred fifty-four thousand, five hundred fifty-nine".