999981684449 has 8 divisors (see below), whose sum is σ = 1148304326880. Its totient is φ = 861228244800.

The previous prime is 999981684409. The next prime is 999981684451. The reversal of 999981684449 is 944486189999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999981684449 - 2¹² = 999981680353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999981684409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2392300472 + ... + 2392300889.

It is an arithmetic number, because the mean of its divisors is an integer number (143538040860).

Almost surely, 2^999981684449 is an apocalyptic number.

It is an amenable number.

999981684449 is a deficient number, since it is larger than the sum of its proper divisors (148322642431).

999981684449 is a wasteful number, since it uses less digits than its factorization.

999981684449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784601391.

The product of its digits is 1451188224, while the sum is 80.

The spelling of 999981684449 in words is "nine hundred ninety-nine billion, nine hundred eighty-one million, six hundred eighty-four thousand, four hundred forty-nine".