161104555543 has 2 divisors, whose sum is σ = 161104555544. Its totient is φ = 161104555542.

The previous prime is 161104555501. The next prime is 161104555609. The reversal of 161104555543 is 345555401161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161104555543 - 2²⁵ = 161071001111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161104555496 and 161104555505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161104555343) 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, 80552277771 + 80552277772.

It is an arithmetic number, because the mean of its divisors is an integer number (80552277772).

Almost surely, 2^161104555543 is an apocalyptic number.

161104555543 is a deficient number, since it is larger than the sum of its proper divisors (1).

161104555543 is an equidigital number, since it uses as much as digits as its factorization.

161104555543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 161104555543 in words is "one hundred sixty-one billion, one hundred four million, five hundred fifty-five thousand, five hundred forty-three".