261646246526141 has 2 divisors, whose sum is σ = 261646246526142. Its totient is φ = 261646246526140.

The previous prime is 261646246526129. The next prime is 261646246526143. The reversal of 261646246526141 is 141625642646162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182799323308900 + 78846923217241 = 13520330^2 + 8879579^2 .

It is a cyclic number.

It is not a de Polignac number, because 261646246526141 - 2²⁶ = 261646179417277 is a prime.

Together with 261646246526143, 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 (261646246526143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823123263070 + 130823123263071.

It is an arithmetic number, because the mean of its divisors is an integer number (130823123263071).

Almost surely, 2^{261646246526141} is an apocalyptic number.

It is an amenable number.

261646246526141 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646246526141 is an equidigital number, since it uses as much as digits as its factorization.

261646246526141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19906560, while the sum is 56.

The spelling of 261646246526141 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-one".