2115665244 has 240 divisors, whose sum is σ = 6957054720. Its totient is φ = 544631040.

The previous prime is 2115665239. The next prime is 2115665273. The reversal of 2115665244 is 4425665112.

2115665244 is a `hidden beast` number, since 2 + 1 + 1 + 566 + 52 + 44 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2115665199 and 2115665208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3417567 + ... + 3418185.

It is an arithmetic number, because the mean of its divisors is an integer number (28987728).

Almost surely, 2^2115665244 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 2115665244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3478527360).

2115665244 is an abundant number, since it is smaller than the sum of its proper divisors (4841389476).

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

2115665244 is a wasteful number, since it uses less digits than its factorization.

2115665244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 779 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 2115665244 is about 45996.3612039039. The cubic root of 2115665244 is about 1283.7554997810.

The spelling of 2115665244 in words is "two billion, one hundred fifteen million, six hundred sixty-five thousand, two hundred forty-four".