261240142799 has 2 divisors, whose sum is σ = 261240142800. Its totient is φ = 261240142798.

The previous prime is 261240142777. The next prime is 261240142843. The reversal of 261240142799 is 997241042162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261240142799 - 2²⁰ = 261239094223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261240142739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130620071399 + 130620071400.

It is an arithmetic number, because the mean of its divisors is an integer number (130620071400).

Almost surely, 2^261240142799 is an apocalyptic number.

261240142799 is a deficient number, since it is larger than the sum of its proper divisors (1).

261240142799 is an equidigital number, since it uses as much as digits as its factorization.

261240142799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 261240142799 in words is "two hundred sixty-one billion, two hundred forty million, one hundred forty-two thousand, seven hundred ninety-nine".