1378776666887 has 2 divisors, whose sum is σ = 1378776666888. Its totient is φ = 1378776666886.

The previous prime is 1378776666853. The next prime is 1378776666901. The reversal of 1378776666887 is 7886666778731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1378776666887 - 2¹⁰ = 1378776665863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1378776666847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689388333443 + 689388333444.

It is an arithmetic number, because the mean of its divisors is an integer number (689388333444).

Almost surely, 2^{1378776666887} is an apocalyptic number.

1378776666887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378776666887 is an equidigital number, since it uses as much as digits as its factorization.

1378776666887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4779565056, while the sum is 80.

The spelling of 1378776666887 in words is "one trillion, three hundred seventy-eight billion, seven hundred seventy-six million, six hundred sixty-six thousand, eight hundred eighty-seven".