99647979689 has 8 divisors (see below), whose sum is σ = 102222423240. Its totient is φ = 97080393600.

The previous prime is 99647979677. The next prime is 99647979703. The reversal of 99647979689 is 98697974699.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 244609600 + 99403370089 = 15640^2 + 315283^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 99647979689 - 2¹² = 99647975593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99644979689) 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 7 ways as a sum of consecutive naturals, for example, 1684922 + ... + 1743059.

It is an arithmetic number, because the mean of its divisors is an integer number (12777802905).

Almost surely, 2^99647979689 is an apocalyptic number.

It is an amenable number.

99647979689 is a deficient number, since it is larger than the sum of its proper divisors (2574443551).

99647979689 is a wasteful number, since it uses less digits than its factorization.

99647979689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428731.

The product of its digits is 3333197952, while the sum is 83.

The spelling of 99647979689 in words is "ninety-nine billion, six hundred forty-seven million, nine hundred seventy-nine thousand, six hundred eighty-nine".