550321191989 has 2 divisors, whose sum is σ = 550321191990. Its totient is φ = 550321191988.

The previous prime is 550321191971. The next prime is 550321192007. The reversal of 550321191989 is 989191123055.

It is a balanced prime because it is at equal distance from previous prime (550321191971) and next prime (550321192007).

It can be written as a sum of positive squares in only one way, i.e., 320480532100 + 229840659889 = 566110^2 + 479417^2 .

It is a cyclic number.

It is not a de Polignac number, because 550321191989 - 2²⁴ = 550304414773 is a prime.

It is a super-6 number, since 6×550321191989⁶ (a number of 72 digits) contains 666666 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 550321191989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550321194989) 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, 275160595994 + 275160595995.

It is an arithmetic number, because the mean of its divisors is an integer number (275160595995).

Almost surely, 2^550321191989 is an apocalyptic number.

It is an amenable number.

550321191989 is a deficient number, since it is larger than the sum of its proper divisors (1).

550321191989 is an equidigital number, since it uses as much as digits as its factorization.

550321191989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 53.

The spelling of 550321191989 in words is "five hundred fifty billion, three hundred twenty-one million, one hundred ninety-one thousand, nine hundred eighty-nine".