19778875776 has 192 divisors, whose sum is σ = 62219102400. Its totient is φ = 5981137920.

The previous prime is 19778875769. The next prime is 19778875789. The reversal of 19778875776 is 67757887791.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7437135 + ... + 7439793.

It is an arithmetic number, because the mean of its divisors is an integer number (324057825).

Almost surely, 2^19778875776 is an apocalyptic number.

19778875776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19778875776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31109551200).

19778875776 is an abundant number, since it is smaller than the sum of its proper divisors (42440226624).

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

19778875776 is a wasteful number, since it uses less digits than its factorization.

19778875776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3277 (or 3262 counting only the distinct ones).

The product of its digits is 290424960, while the sum is 72.

The spelling of 19778875776 in words is "nineteen billion, seven hundred seventy-eight million, eight hundred seventy-five thousand, seven hundred seventy-six".