261432140477171 has 2 divisors, whose sum is σ = 261432140477172. Its totient is φ = 261432140477170.

The previous prime is 261432140477159. The next prime is 261432140477191. The reversal of 261432140477171 is 171774041234162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261432140477171 - 2¹⁸ = 261432140215027 is a prime.

It is a super-3 number, since 3×261432140477171³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (261432140477191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130716070238585 + 130716070238586.

It is an arithmetic number, because the mean of its divisors is an integer number (130716070238586).

Almost surely, 2^{261432140477171} is an apocalyptic number.

261432140477171 is a deficient number, since it is larger than the sum of its proper divisors (1).

261432140477171 is an equidigital number, since it uses as much as digits as its factorization.

261432140477171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 261432140477171 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred forty million, four hundred seventy-seven thousand, one hundred seventy-one".