1668516851707 has 2 divisors, whose sum is σ = 1668516851708. Its totient is φ = 1668516851706.

The previous prime is 1668516851669. The next prime is 1668516851713. The reversal of 1668516851707 is 7071586158661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668516851707 - 2²⁷ = 1668382633979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668516851107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834258425853 + 834258425854.

It is an arithmetic number, because the mean of its divisors is an integer number (834258425854).

Almost surely, 2^{1668516851707} is an apocalyptic number.

1668516851707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668516851707 is an equidigital number, since it uses as much as digits as its factorization.

1668516851707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 61.

The spelling of 1668516851707 in words is "one trillion, six hundred sixty-eight billion, five hundred sixteen million, eight hundred fifty-one thousand, seven hundred seven".