261446981447 has 2 divisors, whose sum is σ = 261446981448. Its totient is φ = 261446981446.

The previous prime is 261446981407. The next prime is 261446981491. The reversal of 261446981447 is 744189644162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261446981447 - 2¹⁰ = 261446980423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261446981392 and 261446981401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261446981407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130723490723 + 130723490724.

It is an arithmetic number, because the mean of its divisors is an integer number (130723490724).

Almost surely, 2^261446981447 is an apocalyptic number.

261446981447 is a deficient number, since it is larger than the sum of its proper divisors (1).

261446981447 is an equidigital number, since it uses as much as digits as its factorization.

261446981447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 56.

The spelling of 261446981447 in words is "two hundred sixty-one billion, four hundred forty-six million, nine hundred eighty-one thousand, four hundred forty-seven".