16643116491 has 8 divisors (see below), whose sum is σ = 22221688320. Its totient is φ = 11079977832.

The previous prime is 16643116463. The next prime is 16643116513. The reversal of 16643116491 is 19461134661.

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

It is not a de Polignac number, because 16643116491 - 2⁵ = 16643116459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16643136491) 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, 3855775 + ... + 3860088.

It is an arithmetic number, because the mean of its divisors is an integer number (2777711040).

Almost surely, 2^16643116491 is an apocalyptic number.

16643116491 is a deficient number, since it is larger than the sum of its proper divisors (5578571829).

16643116491 is an equidigital number, since it uses as much as digits as its factorization.

16643116491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7716585.

The product of its digits is 93312, while the sum is 42.

The spelling of 16643116491 in words is "sixteen billion, six hundred forty-three million, one hundred sixteen thousand, four hundred ninety-one".