261163516127 has 2 divisors, whose sum is σ = 261163516128. Its totient is φ = 261163516126.

The previous prime is 261163516093. The next prime is 261163516177. The reversal of 261163516127 is 721615361162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261163516127 - 2¹⁰ = 261163515103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261163516177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130581758063 + 130581758064.

It is an arithmetic number, because the mean of its divisors is an integer number (130581758064).

Almost surely, 2^261163516127 is an apocalyptic number.

261163516127 is a deficient number, since it is larger than the sum of its proper divisors (1).

261163516127 is an equidigital number, since it uses as much as digits as its factorization.

261163516127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

Adding to 261163516127 its reverse (721615361162), we get a palindrome (982778877289).

The spelling of 261163516127 in words is "two hundred sixty-one billion, one hundred sixty-three million, five hundred sixteen thousand, one hundred twenty-seven".