1668131218327 has 4 divisors (see below), whose sum is σ = 1906435678096. Its totient is φ = 1429826758560.

The previous prime is 1668131218301. The next prime is 1668131218381. The reversal of 1668131218327 is 7238121318661.

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 1668131218327 - 2⁷ = 1668131218199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668131218027) 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, 119152229874 + ... + 119152229887.

It is an arithmetic number, because the mean of its divisors is an integer number (476608919524).

Almost surely, 2^{1668131218327} is an apocalyptic number.

1668131218327 is a deficient number, since it is larger than the sum of its proper divisors (238304459769).

1668131218327 is an equidigital number, since it uses as much as digits as its factorization.

1668131218327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238304459768.

The product of its digits is 580608, while the sum is 49.

The spelling of 1668131218327 in words is "one trillion, six hundred sixty-eight billion, one hundred thirty-one million, two hundred eighteen thousand, three hundred twenty-seven".