261335011523 has 2 divisors, whose sum is σ = 261335011524. Its totient is φ = 261335011522.

The previous prime is 261335011513. The next prime is 261335011543. The reversal of 261335011523 is 325110533162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261335011523 - 2¹⁶ = 261334945987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261335011523.

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, 130667505761 + 130667505762.

It is an arithmetic number, because the mean of its divisors is an integer number (130667505762).

Almost surely, 2^261335011523 is an apocalyptic number.

261335011523 is a deficient number, since it is larger than the sum of its proper divisors (1).

261335011523 is an equidigital number, since it uses as much as digits as its factorization.

261335011523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 261335011523 its reverse (325110533162), we get a palindrome (586445544685).

The spelling of 261335011523 in words is "two hundred sixty-one billion, three hundred thirty-five million, eleven thousand, five hundred twenty-three".