261659553059 has 2 divisors, whose sum is σ = 261659553060. Its totient is φ = 261659553058.

The previous prime is 261659553053. The next prime is 261659553121. The reversal of 261659553059 is 950355956162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261659553059 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 261659552995 and 261659553013.

It is not a weakly prime, because it can be changed into another prime (261659553053) 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, 130829776529 + 130829776530.

It is an arithmetic number, because the mean of its divisors is an integer number (130829776530).

Almost surely, 2^261659553059 is an apocalyptic number.

261659553059 is a deficient number, since it is larger than the sum of its proper divisors (1).

261659553059 is an equidigital number, since it uses as much as digits as its factorization.

261659553059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10935000, while the sum is 56.

The spelling of 261659553059 in words is "two hundred sixty-one billion, six hundred fifty-nine million, five hundred fifty-three thousand, fifty-nine".