550401243120991 has 2 divisors, whose sum is σ = 550401243120992. Its totient is φ = 550401243120990.

The previous prime is 550401243120979. The next prime is 550401243121019. The reversal of 550401243120991 is 199021342104055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 550401243120991 - 2¹⁵ = 550401243088223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550401243120901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275200621560495 + 275200621560496.

It is an arithmetic number, because the mean of its divisors is an integer number (275200621560496).

Almost surely, 2^{550401243120991} is an apocalyptic number.

550401243120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

550401243120991 is an equidigital number, since it uses as much as digits as its factorization.

550401243120991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 550401243120991 in words is "five hundred fifty trillion, four hundred one billion, two hundred forty-three million, one hundred twenty thousand, nine hundred ninety-one".