16663840379 has 2 divisors, whose sum is σ = 16663840380. Its totient is φ = 16663840378.

The previous prime is 16663840339. The next prime is 16663840397. The reversal of 16663840379 is 97304836661.

Together with next prime (16663840397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16663840379 - 2²⁴ = 16647063163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16663840379.

It is not a weakly prime, because it can be changed into another prime (16663840339) 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 as a sum of consecutive naturals, namely, 8331920189 + 8331920190.

It is an arithmetic number, because the mean of its divisors is an integer number (8331920190).

Almost surely, 2^16663840379 is an apocalyptic number.

16663840379 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663840379 is an equidigital number, since it uses as much as digits as its factorization.

16663840379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 16663840379 in words is "sixteen billion, six hundred sixty-three million, eight hundred forty thousand, three hundred seventy-nine".