1261457663071 has 2 divisors, whose sum is σ = 1261457663072. Its totient is φ = 1261457663070.

The previous prime is 1261457663017. The next prime is 1261457663093. The reversal of 1261457663071 is 1703667541621.

It is a happy number.

Together with previous prime (1261457663017) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261457663071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261457663971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630728831535 + 630728831536.

It is an arithmetic number, because the mean of its divisors is an integer number (630728831536).

Almost surely, 2^{1261457663071} is an apocalyptic number.

1261457663071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261457663071 is an equidigital number, since it uses as much as digits as its factorization.

1261457663071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 1261457663071 in words is "one trillion, two hundred sixty-one billion, four hundred fifty-seven million, six hundred sixty-three thousand, seventy-one".