2155117472 has 48 divisors (see below), whose sum is σ = 4549426560. Its totient is φ = 1001315328.

The previous prime is 2155117463. The next prime is 2155117501. The reversal of 2155117472 is 2747115512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17903 + ... + 68049.

It is an arithmetic number, because the mean of its divisors is an integer number (94779720).

Almost surely, 2^2155117472 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 2155117472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2274713280).

2155117472 is an abundant number, since it is smaller than the sum of its proper divisors (2394309088).

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

2155117472 is a wasteful number, since it uses less digits than its factorization.

2155117472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50253 (or 50245 counting only the distinct ones).

The product of its digits is 19600, while the sum is 35.

The square root of 2155117472 is about 46423.2427992703. The cubic root of 2155117472 is about 1291.6860896161.

The spelling of 2155117472 in words is "two billion, one hundred fifty-five million, one hundred seventeen thousand, four hundred seventy-two".