19785855360 has 64 divisors (see below), whose sum is σ = 63067420080. Its totient is φ = 5276227584.

The previous prime is 19785855347. The next prime is 19785855361. The reversal of 19785855360 is 6355858791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 19785855360.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19785855361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5150647 + ... + 5154486.

Almost surely, 2^19785855360 is an apocalyptic number.

19785855360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19785855360 is an abundant number, since it is smaller than the sum of its proper divisors (43281564720).

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

19785855360 is a wasteful number, since it uses less digits than its factorization.

19785855360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10305155 (or 10305143 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 57.

The spelling of 19785855360 in words is "nineteen billion, seven hundred eighty-five million, eight hundred fifty-five thousand, three hundred sixty".