989154817563 has 18 divisors (see below), whose sum is σ = 1449698192796. Its totient is φ = 599476284000.

The previous prime is 989154817543. The next prime is 989154817579. The reversal of 989154817563 is 365718451989.

It is not a de Polignac number, because 989154817563 - 2¹² = 989154813467 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989154817494 and 989154817503.

It is not an unprimeable number, because it can be changed into a prime (989154817523) 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, 18922863 + ... + 18975063.

Almost surely, 2^989154817563 is an apocalyptic number.

989154817563 is a deficient number, since it is larger than the sum of its proper divisors (460543375233).

989154817563 is an frugal number, since it uses more digits than its factorization.

989154817563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104427 (or 52215 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 66.

The spelling of 989154817563 in words is "nine hundred eighty-nine billion, one hundred fifty-four million, eight hundred seventeen thousand, five hundred sixty-three".