16491824641 has 4 divisors (see below), whose sum is σ = 16762182484. Its totient is φ = 16221466800.

The previous prime is 16491824599. The next prime is 16491824669. The reversal of 16491824641 is 14642819461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8686985616 + 7804839025 = 93204^2 + 88345^2 .

It is a cyclic number.

It is not a de Polignac number, because 16491824641 - 2⁷ = 16491824513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16491824591 and 16491824600.

It is not an unprimeable number, because it can be changed into a prime (16491824681) 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, 135178830 + ... + 135178951.

It is an arithmetic number, because the mean of its divisors is an integer number (4190545621).

Almost surely, 2^16491824641 is an apocalyptic number.

It is an amenable number.

16491824641 is a deficient number, since it is larger than the sum of its proper divisors (270357843).

16491824641 is an equidigital number, since it uses as much as digits as its factorization.

16491824641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270357842.

The product of its digits is 331776, while the sum is 46.

The spelling of 16491824641 in words is "sixteen billion, four hundred ninety-one million, eight hundred twenty-four thousand, six hundred forty-one".