16989297649 has 3 divisors (see below), whose sum is σ = 16989427993. Its totient is φ = 16989167306.

The previous prime is 16989297641. The next prime is 16989297653. The reversal of 16989297649 is 94679298961.

The square root of 16989297649 is 130343.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94679298961 = 13 ⋅7283022997.

It is not a de Polignac number, because 16989297649 - 2³ = 16989297641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16989297641) 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 2 ways as a sum of consecutive naturals, for example, 65172 + ... + 195514.

Almost surely, 2^16989297649 is an apocalyptic number.

16989297649 is the 130343-rd square number.

16989297649 is the 65172-nd centered octagonal number.

It is an amenable number.

16989297649 is a deficient number, since it is larger than the sum of its proper divisors (130344).

16989297649 is an frugal number, since it uses more digits than its factorization.

16989297649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260686 (or 130343 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 70.

The spelling of 16989297649 in words is "sixteen billion, nine hundred eighty-nine million, two hundred ninety-seven thousand, six hundred forty-nine".