6661100 has 36 divisors (see below), whose sum is σ = 14712600. Its totient is φ = 2616960.

The previous prime is 6661091. The next prime is 6661103. The reversal of 6661100 is 11666.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6661103) 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, 5336 + ... + 6464.

Almost surely, 2^6661100 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 6661100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7356300).

6661100 is an abundant number, since it is smaller than the sum of its proper divisors (8051500).

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

6661100 is a wasteful number, since it uses less digits than its factorization.

6661100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 6661100 is about 2580.9106919845. The cubic root of 6661100 is about 188.1548068502.

Adding to 6661100 its reverse (11666), we get a palindrome (6672766).

The spelling of 6661100 in words is "six million, six hundred sixty-one thousand, one hundred".