1261263277447 has 2 divisors, whose sum is σ = 1261263277448. Its totient is φ = 1261263277446.

The previous prime is 1261263277387. The next prime is 1261263277457. The reversal of 1261263277447 is 7447723621621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261263277447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1261263277394 and 1261263277403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261263277457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630631638723 + 630631638724.

It is an arithmetic number, because the mean of its divisors is an integer number (630631638724).

Almost surely, 2^{1261263277447} is an apocalyptic number.

1261263277447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261263277447 is an equidigital number, since it uses as much as digits as its factorization.

1261263277447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4741632, while the sum is 52.

The spelling of 1261263277447 in words is "one trillion, two hundred sixty-one billion, two hundred sixty-three million, two hundred seventy-seven thousand, four hundred forty-seven".