155405042543 has 2 divisors, whose sum is σ = 155405042544. Its totient is φ = 155405042542.

The previous prime is 155405042537. The next prime is 155405042557. The reversal of 155405042543 is 345240504551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155405042543 - 2²⁶ = 155337933679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155405042497 and 155405042506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155405042743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77702521271 + 77702521272.

It is an arithmetic number, because the mean of its divisors is an integer number (77702521272).

Almost surely, 2^155405042543 is an apocalyptic number.

155405042543 is a deficient number, since it is larger than the sum of its proper divisors (1).

155405042543 is an equidigital number, since it uses as much as digits as its factorization.

155405042543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240000, while the sum is 38.

The spelling of 155405042543 in words is "one hundred fifty-five billion, four hundred five million, forty-two thousand, five hundred forty-three".