1668351666985 has 8 divisors (see below), whose sum is σ = 2002398140160. Its totient is φ = 1334430573744.

The previous prime is 1668351666953. The next prime is 1668351666991. The reversal of 1668351666985 is 5896661538661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668351666985 - 2⁵ = 1668351666953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31315705 + ... + 31368934.

It is an arithmetic number, because the mean of its divisors is an integer number (250299767520).

Almost surely, 2^{1668351666985} is an apocalyptic number.

It is an amenable number.

1668351666985 is a deficient number, since it is larger than the sum of its proper divisors (334046473175).

1668351666985 is an equidigital number, since it uses as much as digits as its factorization.

1668351666985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62689967.

The product of its digits is 335923200, while the sum is 70.

The spelling of 1668351666985 in words is "one trillion, six hundred sixty-eight billion, three hundred fifty-one million, six hundred sixty-six thousand, nine hundred eighty-five".