19989765894672 has 60 divisors (see below), whose sum is σ = 63935521079040. Its totient is φ = 5711361683904.

The previous prime is 19989765894649. The next prime is 19989765894673. The reversal of 19989765894672 is 27649856798991.

19989765894672 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 9 + 7 + 65 + 89 + 467 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (19989765894673) 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 11 ways as a sum of consecutive naturals, for example, 9915557472 + ... + 9915559487.

It is an arithmetic number, because the mean of its divisors is an integer number (1065592017984).

Almost surely, 2^{19989765894672} is an apocalyptic number.

19989765894672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19989765894672 is an abundant number, since it is smaller than the sum of its proper divisors (43945755184368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19989765894672 is a wasteful number, since it uses less digits than its factorization.

19989765894672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19831116980 (or 19831116971 counting only the distinct ones).

The product of its digits is 29628426240, while the sum is 90.

The spelling of 19989765894672 in words is "nineteen trillion, nine hundred eighty-nine billion, seven hundred sixty-five million, eight hundred ninety-four thousand, six hundred seventy-two".