1261865927711 has 2 divisors, whose sum is σ = 1261865927712. Its totient is φ = 1261865927710.

The previous prime is 1261865927659. The next prime is 1261865927731. The reversal of 1261865927711 is 1177295681621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261865927711 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261865927731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630932963855 + 630932963856.

It is an arithmetic number, because the mean of its divisors is an integer number (630932963856).

Almost surely, 2^{1261865927711} is an apocalyptic number.

1261865927711 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261865927711 is an equidigital number, since it uses as much as digits as its factorization.

1261865927711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 56.

The spelling of 1261865927711 in words is "one trillion, two hundred sixty-one billion, eight hundred sixty-five million, nine hundred twenty-seven thousand, seven hundred eleven".