19773484820568 has 192 divisors, whose sum is σ = 56054284135200. Its totient is φ = 6290229104640.

The previous prime is 19773484820563. The next prime is 19773484820591. The reversal of 19773484820568 is 86502848437791.

It is a happy number.

19773484820568 is a `hidden beast` number, since 1 + 9 + 7 + 7 + 3 + 484 + 82 + 0 + 5 + 68 = 666.

It is a super-2 number, since 2×19773484820568² (a number of 27 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 19773484820496 and 19773484820505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19773484820563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 549077683 + ... + 549113693.

It is a 1-persistent number, because it is pandigital, but 2⋅19773484820568 = 39546969641136 is not.

Almost surely, 2^{19773484820568} is an apocalyptic number.

19773484820568 is a gapful number since it is divisible by the number (18) 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 19773484820568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28027142067600).

19773484820568 is an abundant number, since it is smaller than the sum of its proper divisors (36280799314632).

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

19773484820568 is a wasteful number, since it uses less digits than its factorization.

19773484820568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40002 (or 39995 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 72.

The spelling of 19773484820568 in words is "nineteen trillion, seven hundred seventy-three billion, four hundred eighty-four million, eight hundred twenty thousand, five hundred sixty-eight".