2115810018 has 128 divisors (see below), whose sum is σ = 5742028800. Its totient is φ = 564024384.

The previous prime is 2115810001. The next prime is 2115810041. The reversal of 2115810018 is 8100185112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 2115809973 and 2115810000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 478996 + ... + 483392.

It is an arithmetic number, because the mean of its divisors is an integer number (44859600).

Almost surely, 2^2115810018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115810018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2871014400).

2115810018 is an abundant number, since it is smaller than the sum of its proper divisors (3626218782).

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

2115810018 is a wasteful number, since it uses less digits than its factorization.

2115810018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 2115810018 is about 45997.9349319075. The cubic root of 2115810018 is about 1283.7847813793.

The spelling of 2115810018 in words is "two billion, one hundred fifteen million, eight hundred ten thousand, eighteen".