19489746816 has 96 divisors (see below), whose sum is σ = 57142140120. Its totient is φ = 6373985280.

The previous prime is 19489746811. The next prime is 19489746827. The reversal of 19489746816 is 61864798491.

19489746816 is a `hidden beast` number, since 1 + 9 + 489 + 74 + 6 + 81 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19489746811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98550 + ... + 220661.

Almost surely, 2^19489746816 is an apocalyptic number.

19489746816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19489746816 is an abundant number, since it is smaller than the sum of its proper divisors (37652393304).

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

19489746816 is a wasteful number, since it uses less digits than its factorization.

19489746816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319284 (or 319269 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 19489746816 in words is "nineteen billion, four hundred eighty-nine million, seven hundred forty-six thousand, eight hundred sixteen".