6630861 has 4 divisors (see below), whose sum is σ = 8841152. Its totient is φ = 4420572.

The previous prime is 6630859. The next prime is 6630887. The reversal of 6630861 is 1680366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6630861 - 2¹ = 6630859 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6630851) 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 3 ways as a sum of consecutive naturals, for example, 1105141 + ... + 1105146.

It is an arithmetic number, because the mean of its divisors is an integer number (2210288).

Almost surely, 2^6630861 is an apocalyptic number.

It is an amenable number.

6630861 is a deficient number, since it is larger than the sum of its proper divisors (2210291).

6630861 is a wasteful number, since it uses less digits than its factorization.

6630861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210290.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6630861 is about 2575.0458248350. The cubic root of 6630861 is about 187.8696565205.

The spelling of 6630861 in words is "six million, six hundred thirty thousand, eight hundred sixty-one".