16491644269 has 4 divisors (see below), whose sum is σ = 16520526880. Its totient is φ = 16462761660.

The previous prime is 16491644261. The next prime is 16491644311. The reversal of 16491644269 is 96244619461.

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 16491644269 - 2³ = 16491644261 is a prime.

It is a super-2 number, since 2×16491644269² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16491644261) 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, 14440449 + ... + 14441590.

It is an arithmetic number, because the mean of its divisors is an integer number (4130131720).

Almost surely, 2^16491644269 is an apocalyptic number.

It is an amenable number.

16491644269 is a deficient number, since it is larger than the sum of its proper divisors (28882611).

16491644269 is an equidigital number, since it uses as much as digits as its factorization.

16491644269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28882610.

The product of its digits is 2239488, while the sum is 52.

The spelling of 16491644269 in words is "sixteen billion, four hundred ninety-one million, six hundred forty-four thousand, two hundred sixty-nine".