16663129727 has 4 divisors (see below), whose sum is σ = 16663555440. Its totient is φ = 16662704016.

The previous prime is 16663129699. The next prime is 16663129733. The reversal of 16663129727 is 72792136661.

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 16663129727 - 2⁶ = 16663129663 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 (16663129787) 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, 147443 + ... + 234660.

It is an arithmetic number, because the mean of its divisors is an integer number (4165888860).

Almost surely, 2^16663129727 is an apocalyptic number.

16663129727 is a deficient number, since it is larger than the sum of its proper divisors (425713).

16663129727 is an equidigital number, since it uses as much as digits as its factorization.

16663129727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425712.

The product of its digits is 1143072, while the sum is 50.

The spelling of 16663129727 in words is "sixteen billion, six hundred sixty-three million, one hundred twenty-nine thousand, seven hundred twenty-seven".