1271206661111 has 2 divisors, whose sum is σ = 1271206661112. Its totient is φ = 1271206661110.

The previous prime is 1271206661071. The next prime is 1271206661143. The reversal of 1271206661111 is 1111666021721.

It is a strong prime.

It is an emirp because it is prime and its reverse (1111666021721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1271206661111 - 2³⁰ = 1270132919287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271206661911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635603330555 + 635603330556.

It is an arithmetic number, because the mean of its divisors is an integer number (635603330556).

Almost surely, 2^{1271206661111} is an apocalyptic number.

1271206661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271206661111 is an equidigital number, since it uses as much as digits as its factorization.

1271206661111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The spelling of 1271206661111 in words is "one trillion, two hundred seventy-one billion, two hundred six million, six hundred sixty-one thousand, one hundred eleven".