2161604403216 has 60 divisors (see below), whose sum is σ = 6069195404272. Its totient is φ = 718187767488.

The previous prime is 2161604403191. The next prime is 2161604403223. The reversal of 2161604403216 is 6123044061612.

2161604403216 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 604 + 4 + 0 + 32 + 16 = 666.

It is a super-2 number, since 2×2161604403216² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 24403906 + ... + 24492321.

Almost surely, 2^{2161604403216} is an apocalyptic number.

It is an amenable number.

2161604403216 is an abundant number, since it is smaller than the sum of its proper divisors (3907591001056).

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

2161604403216 is a wasteful number, since it uses less digits than its factorization.

2161604403216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48896548 (or 48896539 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 2161604403216 its reverse (6123044061612), we get a palindrome (8284648464828).

The spelling of 2161604403216 in words is "two trillion, one hundred sixty-one billion, six hundred four million, four hundred three thousand, two hundred sixteen".