19855544806656 has 216 divisors, whose sum is σ = 63640938256896. Its totient is φ = 5912320757760.

The previous prime is 19855544806637. The next prime is 19855544806681. The reversal of 19855544806656 is 65660844555891.

19855544806656 is a `hidden beast` number, since 1 + 9 + 8 + 5 + 554 + 4 + 8 + 0 + 6 + 65 + 6 = 666.

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, 9763620 + ... + 11620643.

Almost surely, 2^{19855544806656} is an apocalyptic number.

19855544806656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19855544806656 is an abundant number, since it is smaller than the sum of its proper divisors (43785393450240).

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

19855544806656 is a wasteful number, since it uses less digits than its factorization.

19855544806656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21384329 (or 21384312 counting only the distinct ones).

The product of its (nonzero) digits is 1244160000, while the sum is 72.

The spelling of 19855544806656 in words is "nineteen trillion, eight hundred fifty-five billion, five hundred forty-four million, eight hundred six thousand, six hundred fifty-six".