261543150544223 has 2 divisors, whose sum is σ = 261543150544224. Its totient is φ = 261543150544222.

The previous prime is 261543150544187. The next prime is 261543150544229. The reversal of 261543150544223 is 322445051345162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261543150544223 - 2¹⁸ = 261543150282079 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261543150544229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130771575272111 + 130771575272112.

It is an arithmetic number, because the mean of its divisors is an integer number (130771575272112).

Almost surely, 2^{261543150544223} is an apocalyptic number.

261543150544223 is a deficient number, since it is larger than the sum of its proper divisors (1).

261543150544223 is an equidigital number, since it uses as much as digits as its factorization.

261543150544223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456000, while the sum is 47.

The spelling of 261543150544223 in words is "two hundred sixty-one trillion, five hundred forty-three billion, one hundred fifty million, five hundred forty-four thousand, two hundred twenty-three".