261766447426811 has 2 divisors, whose sum is σ = 261766447426812. Its totient is φ = 261766447426810.

The previous prime is 261766447426741. The next prime is 261766447426871. The reversal of 261766447426811 is 118624744667162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261766447426811 - 2¹⁰ = 261766447425787 is a prime.

It is not a weakly prime, because it can be changed into another prime (261766447426871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130883223713405 + 130883223713406.

It is an arithmetic number, because the mean of its divisors is an integer number (130883223713406).

Almost surely, 2^{261766447426811} is an apocalyptic number.

261766447426811 is a deficient number, since it is larger than the sum of its proper divisors (1).

261766447426811 is an equidigital number, since it uses as much as digits as its factorization.

261766447426811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130056192, while the sum is 65.

The spelling of 261766447426811 in words is "two hundred sixty-one trillion, seven hundred sixty-six billion, four hundred forty-seven million, four hundred twenty-six thousand, eight hundred eleven".