2161163520 has 216 divisors, whose sum is σ = 7736437800. Its totient is φ = 556351488.

The previous prime is 2161163519. The next prime is 2161163551. The reversal of 2161163520 is 253611612.

2161163520 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 1 + 635 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6718464 + 2154445056 = 2592^2 + 46416^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330846 + ... + 337314.

Almost surely, 2^2161163520 is an apocalyptic number.

2161163520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3868218900).

2161163520 is an abundant number, since it is smaller than the sum of its proper divisors (5575274280).

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

2161163520 is a wasteful number, since it uses less digits than its factorization.

2161163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6525 (or 6508 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2161163520 is about 46488.3159514302. The cubic root of 2161163520 is about 1292.8928767866.

The spelling of 2161163520 in words is "two billion, one hundred sixty-one million, one hundred sixty-three thousand, five hundred twenty".