16801552849 has 4 divisors (see below), whose sum is σ = 16804573236. Its totient is φ = 16798532464.

The previous prime is 16801552847. The next prime is 16801552853. The reversal of 16801552849 is 94825510861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94825510861 = 194543 ⋅487427.

It can be written as a sum of positive squares in 2 ways, for example, as 261792400 + 16539760449 = 16180^2 + 128607^2 .

It is a cyclic number.

It is not a de Polignac number, because 16801552849 - 2¹ = 16801552847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16801552847) 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, 1501834 + ... + 1512979.

It is an arithmetic number, because the mean of its divisors is an integer number (4201143309).

Almost surely, 2^16801552849 is an apocalyptic number.

It is an amenable number.

16801552849 is a deficient number, since it is larger than the sum of its proper divisors (3020387).

16801552849 is an equidigital number, since it uses as much as digits as its factorization.

16801552849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020386.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 16801552849 in words is "sixteen billion, eight hundred one million, five hundred fifty-two thousand, eight hundred forty-nine".