19780843324356 has 45 divisors (see below), whose sum is σ = 51711241060479. Its totient is φ = 6593587756056.

The previous prime is 19780843324337. The next prime is 19780843324367. The reversal of 19780843324356 is 65342334808791.

It is a happy number.

The square root of 19780843324356 is 4447566.

It is a perfect power (a square), and thus also a powerful number.

19780843324356 is a `hidden beast` number, since 1 + 97 + 8 + 0 + 84 + 3 + 32 + 435 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19780843324293 and 19780843324302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 79932645 + ... + 80179731.

It is a 1-persistent number, because it is pandigital, but 2⋅19780843324356 = 39561686648712 is not.

Almost surely, 2^{19780843324356} is an apocalyptic number.

19780843324356 is the 4447566-th square number.

It is an amenable number.

19780843324356 is an abundant number, since it is smaller than the sum of its proper divisors (31930397736123).

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

19780843324356 is an frugal number, since it uses more digits than its factorization.

19780843324356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494190 (or 247092 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 63.

The spelling of 19780843324356 in words is "nineteen trillion, seven hundred eighty billion, eight hundred forty-three million, three hundred twenty-four thousand, three hundred fifty-six".