261533575565683 has 2 divisors, whose sum is σ = 261533575565684. Its totient is φ = 261533575565682.

The previous prime is 261533575565663. The next prime is 261533575565791. The reversal of 261533575565683 is 386565575335162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261533575565683 - 2⁵ = 261533575565651 is a prime.

It is a super-2 number, since 2×261533575565683² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261533575565663) 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, 130766787782841 + 130766787782842.

It is an arithmetic number, because the mean of its divisors is an integer number (130766787782842).

Almost surely, 2^{261533575565683} is an apocalyptic number.

261533575565683 is a deficient number, since it is larger than the sum of its proper divisors (1).

261533575565683 is an equidigital number, since it uses as much as digits as its factorization.

261533575565683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200000, while the sum is 70.

The spelling of 261533575565683 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, five hundred seventy-five million, five hundred sixty-five thousand, six hundred eighty-three".