261243860303 has 2 divisors, whose sum is σ = 261243860304. Its totient is φ = 261243860302.

The previous prime is 261243860299. The next prime is 261243860309. The reversal of 261243860303 is 303068342162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261243860303 - 2² = 261243860299 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261243860309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130621930151 + 130621930152.

It is an arithmetic number, because the mean of its divisors is an integer number (130621930152).

Almost surely, 2^261243860303 is an apocalyptic number.

261243860303 is a deficient number, since it is larger than the sum of its proper divisors (1).

261243860303 is an equidigital number, since it uses as much as digits as its factorization.

261243860303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 261243860303 in words is "two hundred sixty-one billion, two hundred forty-three million, eight hundred sixty thousand, three hundred three".