16648438213 has 4 divisors (see below), whose sum is σ = 18161932608. Its totient is φ = 15134943820.

The previous prime is 16648438207. The next prime is 16648438253. The reversal of 16648438213 is 31283484661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16648438213 - 2¹⁷ = 16648307141 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 (16648438253) 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, 756747181 + ... + 756747202.

It is an arithmetic number, because the mean of its divisors is an integer number (4540483152).

Almost surely, 2^16648438213 is an apocalyptic number.

It is an amenable number.

16648438213 is a deficient number, since it is larger than the sum of its proper divisors (1513494395).

16648438213 is a wasteful number, since it uses less digits than its factorization.

16648438213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513494394.

The product of its digits is 663552, while the sum is 46.

Subtracting from 16648438213 its product of digits (663552), we obtain a palindrome (16647774661).

The spelling of 16648438213 in words is "sixteen billion, six hundred forty-eight million, four hundred thirty-eight thousand, two hundred thirteen".