2181646152 has 96 divisors (see below), whose sum is σ = 6782817600. Its totient is φ = 620548992.

The previous prime is 2181646123. The next prime is 2181646153. The reversal of 2181646152 is 2516461812.

It is a happy number.

2181646152 is a `hidden beast` number, since 2 + 1 + 8 + 1 + 646 + 1 + 5 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (2181646153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104874 + ... + 123942.

It is an arithmetic number, because the mean of its divisors is an integer number (70654350).

Almost surely, 2^2181646152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181646152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3391408800).

2181646152 is an abundant number, since it is smaller than the sum of its proper divisors (4601171448).

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

2181646152 is a wasteful number, since it uses less digits than its factorization.

2181646152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19315 (or 19308 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2181646152 is about 46708.0951442039. The cubic root of 2181646152 is about 1296.9645454497.

The spelling of 2181646152 in words is "two billion, one hundred eighty-one million, six hundred forty-six thousand, one hundred fifty-two".