261335011543 has 2 divisors, whose sum is σ = 261335011544. Its totient is φ = 261335011542.

The previous prime is 261335011523. The next prime is 261335011627. The reversal of 261335011543 is 345110533162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261335011543 - 2³³ = 252745076951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261335011499 and 261335011508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261335011513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130667505771 + 130667505772.

It is an arithmetic number, because the mean of its divisors is an integer number (130667505772).

Almost surely, 2^261335011543 is an apocalyptic number.

261335011543 is a deficient number, since it is larger than the sum of its proper divisors (1).

261335011543 is an equidigital number, since it uses as much as digits as its factorization.

261335011543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 261335011543 in words is "two hundred sixty-one billion, three hundred thirty-five million, eleven thousand, five hundred forty-three".