1647011685667 has 2 divisors, whose sum is σ = 1647011685668. Its totient is φ = 1647011685666.

The previous prime is 1647011685623. The next prime is 1647011685679. The reversal of 1647011685667 is 7665861107461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1647011685667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1647011685467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823505842833 + 823505842834.

It is an arithmetic number, because the mean of its divisors is an integer number (823505842834).

Almost surely, 2^{1647011685667} is an apocalyptic number.

1647011685667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647011685667 is an equidigital number, since it uses as much as digits as its factorization.

1647011685667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 1647011685667 in words is "one trillion, six hundred forty-seven billion, eleven million, six hundred eighty-five thousand, six hundred sixty-seven".