2118100644 has 144 divisors (see below), whose sum is σ = 6095443200. Its totient is φ = 635532480.

The previous prime is 2118100619. The next prime is 2118100651. The reversal of 2118100644 is 4460018112.

It is a happy number.

2118100644 is a `hidden beast` number, since 2 + 1 + 1 + 8 + 10 + 0 + 644 = 666.

It is a super-2 number, since 2×2118100644² = 8972700676226429472, which contains 22 as substring.

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

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 47 ways as a sum of consecutive naturals, for example, 1423669 + ... + 1425155.

Almost surely, 2^2118100644 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 2118100644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047721600).

2118100644 is an abundant number, since it is smaller than the sum of its proper divisors (3977342556).

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

2118100644 is a wasteful number, since it uses less digits than its factorization.

2118100644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 2118100644 is about 46022.8274229213. The cubic root of 2118100644 is about 1284.2478995544.

Adding to 2118100644 its reverse (4460018112), we get a palindrome (6578118756).

The spelling of 2118100644 in words is "two billion, one hundred eighteen million, one hundred thousand, six hundred forty-four".