9969919849 has 4 divisors (see below), whose sum is σ = 10133361220. Its totient is φ = 9806478480.

The previous prime is 9969919793. The next prime is 9969919877. The reversal of 9969919849 is 9489199699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9489199699 = 7 ⋅1355599957.

It can be written as a sum of positive squares in 2 ways, for example, as 5571577449 + 4398342400 = 74643^2 + 66320^2 .

It is a cyclic number.

It is not a de Polignac number, because 9969919849 - 2³¹ = 7822436201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9969919049) 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, 81720594 + ... + 81720715.

It is an arithmetic number, because the mean of its divisors is an integer number (2533340305).

Almost surely, 2^9969919849 is an apocalyptic number.

It is an amenable number.

9969919849 is a deficient number, since it is larger than the sum of its proper divisors (163441371).

9969919849 is a wasteful number, since it uses less digits than its factorization.

9969919849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163441370.

The product of its digits is 102036672, while the sum is 73.

The square root of 9969919849 is about 99849.4859726378. The cubic root of 9969919849 is about 2152.2723297498.

The spelling of 9969919849 in words is "nine billion, nine hundred sixty-nine million, nine hundred nineteen thousand, eight hundred forty-nine".