1361555603543 has 2 divisors, whose sum is σ = 1361555603544. Its totient is φ = 1361555603542.

The previous prime is 1361555603539. The next prime is 1361555603561. The reversal of 1361555603543 is 3453065551631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1361555603543 - 2² = 1361555603539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1361555603533) 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, 680777801771 + 680777801772.

It is an arithmetic number, because the mean of its divisors is an integer number (680777801772).

Almost surely, 2^{1361555603543} is an apocalyptic number.

1361555603543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361555603543 is an equidigital number, since it uses as much as digits as its factorization.

1361555603543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430000, while the sum is 47.

The spelling of 1361555603543 in words is "one trillion, three hundred sixty-one billion, five hundred fifty-five million, six hundred three thousand, five hundred forty-three".