205401179389543 has 2 divisors, whose sum is σ = 205401179389544. Its totient is φ = 205401179389542.

The previous prime is 205401179389489. The next prime is 205401179389579. The reversal of 205401179389543 is 345983971104502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205401179389543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205401171389543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102700589694771 + 102700589694772.

It is an arithmetic number, because the mean of its divisors is an integer number (102700589694772).

Almost surely, 2^{205401179389543} is an apocalyptic number.

205401179389543 is a deficient number, since it is larger than the sum of its proper divisors (1).

205401179389543 is an equidigital number, since it uses as much as digits as its factorization.

205401179389543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32659200, while the sum is 61.

The spelling of 205401179389543 in words is "two hundred five trillion, four hundred one billion, one hundred seventy-nine million, three hundred eighty-nine thousand, five hundred forty-three".