261760580261 has 2 divisors, whose sum is σ = 261760580262. Its totient is φ = 261760580260.

The previous prime is 261760580219. The next prime is 261760580309. The reversal of 261760580261 is 162085067162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146225171236 + 115535409025 = 382394^2 + 339905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261760580261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261760580201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130880290130 + 130880290131.

It is an arithmetic number, because the mean of its divisors is an integer number (130880290131).

Almost surely, 2^261760580261 is an apocalyptic number.

It is an amenable number.

261760580261 is a deficient number, since it is larger than the sum of its proper divisors (1).

261760580261 is an equidigital number, since it uses as much as digits as its factorization.

261760580261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 261760580261 in words is "two hundred sixty-one billion, seven hundred sixty million, five hundred eighty thousand, two hundred sixty-one".