16648415160221 has 16 divisors (see below), whose sum is σ = 18042210942000. Its totient is φ = 15361752579264.

The previous prime is 16648415160203. The next prime is 16648415160259. The reversal of 16648415160221 is 12206151484661.

It can be written as a sum of positive squares in 8 ways, for example, as 15536297275321 + 1112117884900 = 3941611^2 + 1054570^2 .

It is not a de Polignac number, because 16648415160221 - 2¹⁰ = 16648415159197 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 (16648415150221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4135955 + ... + 7099503.

It is an arithmetic number, because the mean of its divisors is an integer number (1127638183875).

Almost surely, 2^{16648415160221} is an apocalyptic number.

It is an amenable number.

16648415160221 is a deficient number, since it is larger than the sum of its proper divisors (1393795781779).

16648415160221 is an equidigital number, since it uses as much as digits as its factorization.

16648415160221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966145 (or 2966119 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 16648415160221 in words is "sixteen trillion, six hundred forty-eight billion, four hundred fifteen million, one hundred sixty thousand, two hundred twenty-one".