9821780100164 has 24 divisors (see below), whose sum is σ = 17320197299328. Its totient is φ = 4873251482240.

The previous prime is 9821780100109. The next prime is 9821780100191. The reversal of 9821780100164 is 4610010871289.

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 7 ways as a sum of consecutive naturals, for example, 12001232 + ... + 12793479.

It is an arithmetic number, because the mean of its divisors is an integer number (721674887472).

Almost surely, 2^{9821780100164} is an apocalyptic number.

It is an amenable number.

9821780100164 is a deficient number, since it is larger than the sum of its proper divisors (7498417199164).

9821780100164 is a wasteful number, since it uses less digits than its factorization.

9821780100164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24795475 (or 24795473 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 9821780100164 in words is "nine trillion, eight hundred twenty-one billion, seven hundred eighty million, one hundred thousand, one hundred sixty-four".