6661100844 has 36 divisors (see below), whose sum is σ = 17155481616. Its totient is φ = 2178472608.

The previous prime is 6661100843. The next prime is 6661100867. The reversal of 6661100844 is 4480011666.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 6661100799 and 6661100808.

It is not an unprimeable number, because it can be changed into a prime (6661100843) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1743664 + ... + 1747479.

It is an arithmetic number, because the mean of its divisors is an integer number (476541156).

Almost surely, 2^6661100844 is an apocalyptic number.

It is an amenable number.

6661100844 is an abundant number, since it is smaller than the sum of its proper divisors (10494380772).

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

6661100844 is a wasteful number, since it uses less digits than its factorization.

6661100844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491206 (or 3491201 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 6661100844 is about 81615.5674121059. The cubic root of 6661100844 is about 1881.5481479696.

The spelling of 6661100844 in words is "six billion, six hundred sixty-one million, one hundred thousand, eight hundred forty-four".