261503310533 has 2 divisors, whose sum is σ = 261503310534. Its totient is φ = 261503310532.

The previous prime is 261503310469. The next prime is 261503310581. The reversal of 261503310533 is 335013305162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218306676289 + 43196634244 = 467233^2 + 207838^2 .

It is a cyclic number.

It is not a de Polignac number, because 261503310533 - 2⁶ = 261503310469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261503310533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261503316533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130751655266 + 130751655267.

It is an arithmetic number, because the mean of its divisors is an integer number (130751655267).

Almost surely, 2^261503310533 is an apocalyptic number.

It is an amenable number.

261503310533 is a deficient number, since it is larger than the sum of its proper divisors (1).

261503310533 is an equidigital number, since it uses as much as digits as its factorization.

261503310533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 32.

Adding to 261503310533 its reverse (335013305162), we get a palindrome (596516615695).

The spelling of 261503310533 in words is "two hundred sixty-one billion, five hundred three million, three hundred ten thousand, five hundred thirty-three".