551205305543 has 2 divisors, whose sum is σ = 551205305544. Its totient is φ = 551205305542.

The previous prime is 551205305537. The next prime is 551205305557. The reversal of 551205305543 is 345503502155.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551205305543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551205305497 and 551205305506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551205305533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275602652771 + 275602652772.

It is an arithmetic number, because the mean of its divisors is an integer number (275602652772).

Almost surely, 2^551205305543 is an apocalyptic number.

551205305543 is a deficient number, since it is larger than the sum of its proper divisors (1).

551205305543 is an equidigital number, since it uses as much as digits as its factorization.

551205305543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225000, while the sum is 38.

Adding to 551205305543 its reverse (345503502155), we get a palindrome (896708807698).

The spelling of 551205305543 in words is "five hundred fifty-one billion, two hundred five million, three hundred five thousand, five hundred forty-three".