989877778989 has 16 divisors (see below), whose sum is σ = 1454077894464. Its totient is φ = 593986064000.

The previous prime is 989877778973. The next prime is 989877778991.

989877778989 is nontrivially palindromic in base 10.

989877778989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 989877778989 - 2⁴ = 989877778973 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 989877778896 and 989877778905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989877774989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148493184 + ... + 148499849.

It is an arithmetic number, because the mean of its divisors is an integer number (90879868404).

Almost surely, 2^989877778989 is an apocalyptic number.

It is an amenable number.

989877778989 is a deficient number, since it is larger than the sum of its proper divisors (464200115475).

989877778989 is a wasteful number, since it uses less digits than its factorization.

989877778989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296993148.

The product of its digits is 64524128256, while the sum is 96.

The spelling of 989877778989 in words is "nine hundred eighty-nine billion, eight hundred seventy-seven million, seven hundred seventy-eight thousand, nine hundred eighty-nine".