19989089085 has 32 divisors (see below), whose sum is σ = 37150693632. Its totient is φ = 8988065280.

The previous prime is 19989089077. The next prime is 19989089089. The reversal of 19989089085 is 58098098991.

It is not a de Polignac number, because 19989089085 - 2³ = 19989089077 is a prime.

It is a super-2 number, since 2×19989089085² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989089089) 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 31 ways as a sum of consecutive naturals, for example, 1554024 + ... + 1566833.

It is an arithmetic number, because the mean of its divisors is an integer number (1160959176).

Almost surely, 2^19989089085 is an apocalyptic number.

19989089085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19989089085 is a deficient number, since it is larger than the sum of its proper divisors (17161604547).

19989089085 is a wasteful number, since it uses less digits than its factorization.

19989089085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3120933.

The product of its (nonzero) digits is 16796160, while the sum is 66.

The spelling of 19989089085 in words is "nineteen billion, nine hundred eighty-nine million, eighty-nine thousand, eighty-five".