261671598341 has 2 divisors, whose sum is σ = 261671598342. Its totient is φ = 261671598340.

The previous prime is 261671598319. The next prime is 261671598343. The reversal of 261671598341 is 143895176162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234164049025 + 27507549316 = 483905^2 + 165854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261671598341 is a prime.

Together with 261671598343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261671598343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130835799170 + 130835799171.

It is an arithmetic number, because the mean of its divisors is an integer number (130835799171).

Almost surely, 2^261671598341 is an apocalyptic number.

It is an amenable number.

261671598341 is a deficient number, since it is larger than the sum of its proper divisors (1).

261671598341 is an equidigital number, since it uses as much as digits as its factorization.

261671598341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The spelling of 261671598341 in words is "two hundred sixty-one billion, six hundred seventy-one million, five hundred ninety-eight thousand, three hundred forty-one".