17926988449 has 2 divisors, whose sum is σ = 17926988450. Its totient is φ = 17926988448.

The previous prime is 17926988441. The next prime is 17926988557. The reversal of 17926988449 is 94488962971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17326983424 + 600005025 = 131632^2 + 24495^2 .

It is a cyclic number.

It is not a de Polignac number, because 17926988449 - 2³ = 17926988441 is a prime.

It is not a weakly prime, because it can be changed into another prime (17926988441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8963494224 + 8963494225.

It is an arithmetic number, because the mean of its divisors is an integer number (8963494225).

Almost surely, 2^17926988449 is an apocalyptic number.

It is an amenable number.

17926988449 is a deficient number, since it is larger than the sum of its proper divisors (1).

17926988449 is an equidigital number, since it uses as much as digits as its factorization.

17926988449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 67.

The spelling of 17926988449 in words is "seventeen billion, nine hundred twenty-six million, nine hundred eighty-eight thousand, four hundred forty-nine".