1271684759857 has 2 divisors, whose sum is σ = 1271684759858. Its totient is φ = 1271684759856.

The previous prime is 1271684759711. The next prime is 1271684759959. The reversal of 1271684759857 is 7589574861721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1255107939856 + 16576820001 = 1120316^2 + 128751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271684759857 - 2¹¹ = 1271684757809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1271682759857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635842379928 + 635842379929.

It is an arithmetic number, because the mean of its divisors is an integer number (635842379929).

Almost surely, 2^{1271684759857} is an apocalyptic number.

It is an amenable number.

1271684759857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271684759857 is an equidigital number, since it uses as much as digits as its factorization.

1271684759857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 237081600, while the sum is 70.

The spelling of 1271684759857 in words is "one trillion, two hundred seventy-one billion, six hundred eighty-four million, seven hundred fifty-nine thousand, eight hundred fifty-seven".