989737887845 has 18 divisors (see below), whose sum is σ = 1381615034022. Its totient is φ = 678666730896.

The previous prime is 989737887841. The next prime is 989737887857. The reversal of 989737887845 is 548788737989.

It can be written as a sum of positive squares in only one way, i.e., 791790310276 + 197947577569 = 889826^2 + 444913^2 .

It is not a de Polignac number, because 989737887845 - 2² = 989737887841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989737887841) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15540176 + ... + 15603734.

It is an arithmetic number, because the mean of its divisors is an integer number (76756390779).

Almost surely, 2^989737887845 is an apocalyptic number.

It is an amenable number.

989737887845 is a deficient number, since it is larger than the sum of its proper divisors (391877146177).

989737887845 is an frugal number, since it uses more digits than its factorization.

989737887845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127137 (or 63571 counting only the distinct ones).

The product of its digits is 6827950080, while the sum is 83.

The spelling of 989737887845 in words is "nine hundred eighty-nine billion, seven hundred thirty-seven million, eight hundred eighty-seven thousand, eight hundred forty-five".