16489661321 has 8 divisors (see below), whose sum is σ = 19110754944. Its totient is φ = 13934924640.

The previous prime is 16489661317. The next prime is 16489661339. The reversal of 16489661321 is 12316698461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16489661321 - 2² = 16489661317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16489661311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16588700 + ... + 16589693.

It is an arithmetic number, because the mean of its divisors is an integer number (2388844368).

Almost surely, 2^16489661321 is an apocalyptic number.

It is an amenable number.

16489661321 is a deficient number, since it is larger than the sum of its proper divisors (2621093623).

16489661321 is an equidigital number, since it uses as much as digits as its factorization.

16489661321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33178471.

The product of its digits is 373248, while the sum is 47.

The spelling of 16489661321 in words is "sixteen billion, four hundred eighty-nine million, six hundred sixty-one thousand, three hundred twenty-one".