1668518668667 has 4 divisors (see below), whose sum is σ = 1668524880360. Its totient is φ = 1668512456976.

The previous prime is 1668518668601. The next prime is 1668518668697. The reversal of 1668518668667 is 7668668158661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1668518668667 - 2¹⁰ = 1668518667643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668518668594 and 1668518668603.

It is not an unprimeable number, because it can be changed into a prime (1668518668697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2683817 + ... + 3246522.

It is an arithmetic number, because the mean of its divisors is an integer number (417131220090).

Almost surely, 2^{1668518668667} is an apocalyptic number.

1668518668667 is a deficient number, since it is larger than the sum of its proper divisors (6211693).

1668518668667 is an equidigital number, since it uses as much as digits as its factorization.

1668518668667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211692.

The product of its digits is 836075520, while the sum is 74.

The spelling of 1668518668667 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, six hundred sixty-eight thousand, six hundred sixty-seven".