6408991330549 has 2 divisors, whose sum is σ = 6408991330550. Its totient is φ = 6408991330548.

The previous prime is 6408991330487. The next prime is 6408991330571. The reversal of 6408991330549 is 9450331998046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5297615739025 + 1111375591524 = 2301655^2 + 1054218^2 .

It is a cyclic number.

It is not a de Polignac number, because 6408991330549 - 2¹⁵ = 6408991297781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6408991339549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3204495665274 + 3204495665275.

It is an arithmetic number, because the mean of its divisors is an integer number (3204495665275).

Almost surely, 2^{6408991330549} is an apocalyptic number.

It is an amenable number.

6408991330549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6408991330549 is an equidigital number, since it uses as much as digits as its factorization.

6408991330549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25194240, while the sum is 61.

The spelling of 6408991330549 in words is "six trillion, four hundred eight billion, nine hundred ninety-one million, three hundred thirty thousand, five hundred forty-nine".