16489406639 has 4 divisors (see below), whose sum is σ = 16872881256. Its totient is φ = 16105932024.

The previous prime is 16489406627. The next prime is 16489406653. The reversal of 16489406639 is 93660498461.

It is a happy number.

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 16489406639 - 2⁸ = 16489406383 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 (16489406669) 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, 191737244 + ... + 191737329.

It is an arithmetic number, because the mean of its divisors is an integer number (4218220314).

Almost surely, 2^16489406639 is an apocalyptic number.

16489406639 is a deficient number, since it is larger than the sum of its proper divisors (383474617).

16489406639 is an equidigital number, since it uses as much as digits as its factorization.

16489406639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383474616.

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 16489406639 in words is "sixteen billion, four hundred eighty-nine million, four hundred six thousand, six hundred thirty-nine".