201601983621996 has 96 divisors (see below), whose sum is σ = 539328078394560. Its totient is φ = 65083068518400.

The previous prime is 201601983621989. The next prime is 201601983622021. The reversal of 201601983621996 is 699126389106102.

201601983621996 is a `hidden beast` number, since 2 + 0 + 1 + 601 + 9 + 8 + 3 + 6 + 2 + 19 + 9 + 6 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165557245 + ... + 166770516.

It is an arithmetic number, because the mean of its divisors is an integer number (5618000816610).

Almost surely, 2^{201601983621996} is an apocalyptic number.

It is an amenable number.

201601983621996 is an abundant number, since it is smaller than the sum of its proper divisors (337726094772564).

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

201601983621996 is a wasteful number, since it uses less digits than its factorization.

201601983621996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332327952 (or 332327944 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 201601983621996 in words is "two hundred one trillion, six hundred one billion, nine hundred eighty-three million, six hundred twenty-one thousand, nine hundred ninety-six".