6660100 has 18 divisors (see below), whose sum is σ = 14452634. Its totient is φ = 2664000.

The previous prime is 6660091. The next prime is 6660103. The reversal of 6660100 is 10666.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1052676 + 5607424 = 1026^2 + 2368^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33201 + ... + 33400.

Almost surely, 2^6660100 is an apocalyptic number.

It is an amenable number.

6660100 is an abundant number, since it is smaller than the sum of its proper divisors (7792534).

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

6660100 is a wasteful number, since it uses less digits than its factorization.

6660100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66615 (or 66608 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 6660100 is about 2580.7169546465. The cubic root of 6660100 is about 188.1453907766.

Adding to 6660100 its reverse (10666), we get a palindrome (6670766).

The spelling of 6660100 in words is "six million, six hundred sixty thousand, one hundred".