261646246526143 has 2 divisors, whose sum is σ = 261646246526144. Its totient is φ = 261646246526142.

The previous prime is 261646246526141. The next prime is 261646246526201. The reversal of 261646246526143 is 341625642646162.

It is an a-pointer prime, because the next prime (261646246526201) can be obtained adding 261646246526143 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261646246526143 - 2¹ = 261646246526141 is a prime.

Together with 261646246526141, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261646246526141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823123263071 + 130823123263072.

It is an arithmetic number, because the mean of its divisors is an integer number (130823123263072).

Almost surely, 2^{261646246526143} is an apocalyptic number.

261646246526143 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646246526143 is an equidigital number, since it uses as much as digits as its factorization.

261646246526143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59719680, while the sum is 58.

The spelling of 261646246526143 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-six million, five hundred twenty-six thousand, one hundred forty-three".