16665373839971 has 4 divisors (see below), whose sum is σ = 16718960251344. Its totient is φ = 16611787428600.

The previous prime is 16665373839967. The next prime is 16665373840009. The reversal of 16665373839971 is 17993837356661.

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 16665373839971 - 2² = 16665373839967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16665373839911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26793205220 + ... + 26793205841.

It is an arithmetic number, because the mean of its divisors is an integer number (4179740062836).

Almost surely, 2^{16665373839971} is an apocalyptic number.

16665373839971 is a deficient number, since it is larger than the sum of its proper divisors (53586411373).

16665373839971 is an equidigital number, since it uses as much as digits as its factorization.

16665373839971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53586411372.

The product of its digits is 925888320, while the sum is 74.

The spelling of 16665373839971 in words is "sixteen trillion, six hundred sixty-five billion, three hundred seventy-three million, eight hundred thirty-nine thousand, nine hundred seventy-one".