16556021612136 has 48 divisors (see below), whose sum is σ = 45005913821700. Its totient is φ = 5498158348032.

The previous prime is 16556021612113. The next prime is 16556021612147. The reversal of 16556021612136 is 63121612065561.

16556021612136 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 6 + 0 + 21 + 612 + 1 + 3 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16543693951236 + 12327660900 = 4067394^2 + 111030^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16556021612091 and 16556021612100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 427387221 + ... + 427425956.

Almost surely, 2^{16556021612136} is an apocalyptic number.

It is an amenable number.

16556021612136 is an abundant number, since it is smaller than the sum of its proper divisors (28449892209564).

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

16556021612136 is a wasteful number, since it uses less digits than its factorization.

16556021612136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854813458 (or 854813451 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

Adding to 16556021612136 its reverse (63121612065561), we get a palindrome (79677633677697).

The spelling of 16556021612136 in words is "sixteen trillion, five hundred fifty-six billion, twenty-one million, six hundred twelve thousand, one hundred thirty-six".