16549038569 has 12 divisors (see below), whose sum is σ = 20383330644. Its totient is φ = 13350484224.

The previous prime is 16549038559. The next prime is 16549038593. The reversal of 16549038569 is 96583094561.

It can be written as a sum of positive squares in 2 ways, for example, as 7645228969 + 8903809600 = 87437^2 + 94360^2 .

It is not a de Polignac number, because 16549038569 - 2⁴ = 16549038553 is a prime.

It is a super-2 number, since 2×16549038569² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16549038559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9932564 + ... + 9934229.

It is an arithmetic number, because the mean of its divisors is an integer number (1698610887).

Almost surely, 2^16549038569 is an apocalyptic number.

It is an amenable number.

16549038569 is a deficient number, since it is larger than the sum of its proper divisors (3834292075).

16549038569 is a wasteful number, since it uses less digits than its factorization.

16549038569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19866824 (or 19866817 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 16549038569 in words is "sixteen billion, five hundred forty-nine million, thirty-eight thousand, five hundred sixty-nine".