989979686979989 has 8 divisors (see below), whose sum is σ = 1048214788931520. Its totient is φ = 931744696441536.

The previous prime is 989979686979971. The next prime is 989979686980003.

989979686979989 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989979686979989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989979686979929) 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, 9202409 + ... + 45438350.

It is an arithmetic number, because the mean of its divisors is an integer number (131026848616440).

Almost surely, 2^{989979686979989} is an apocalyptic number.

It is an amenable number.

989979686979989 is a deficient number, since it is larger than the sum of its proper divisors (58235101951531).

989979686979989 is a wasteful number, since it uses less digits than its factorization.

989979686979989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55706539.

The product of its digits is 38878420912128, while the sum is 122.

The spelling of 989979686979989 in words is "nine hundred eighty-nine trillion, nine hundred seventy-nine billion, six hundred eighty-six million, nine hundred seventy-nine thousand, nine hundred eighty-nine".