16643719459 has 4 divisors (see below), whose sum is σ = 16644036816. Its totient is φ = 16643402104.

The previous prime is 16643719451. The next prime is 16643719501. The reversal of 16643719459 is 95491734661.

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 16643719459 - 2³ = 16643719451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16643719451) 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, 59239 + ... + 191824.

It is an arithmetic number, because the mean of its divisors is an integer number (4161009204).

Almost surely, 2^16643719459 is an apocalyptic number.

16643719459 is a deficient number, since it is larger than the sum of its proper divisors (317357).

16643719459 is an equidigital number, since it uses as much as digits as its factorization.

16643719459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317356.

The product of its digits is 4898880, while the sum is 55.

The spelling of 16643719459 in words is "sixteen billion, six hundred forty-three million, seven hundred nineteen thousand, four hundred fifty-nine".