6659994 has 64 divisors (see below), whose sum is σ = 15759360. Its totient is φ = 1854720.

The previous prime is 6659977. The next prime is 6660011. The reversal of 6659994 is 4999566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6659977) and next prime (6660011).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58882 + ... + 58994.

It is an arithmetic number, because the mean of its divisors is an integer number (246240).

Almost surely, 2^6659994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6659994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7879680).

6659994 is an abundant number, since it is smaller than the sum of its proper divisors (9099366).

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

6659994 is a wasteful number, since it uses less digits than its factorization.

6659994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its digits is 524880, while the sum is 48.

The square root of 6659994 is about 2580.6964176361. The cubic root of 6659994 is about 188.1443926176.

The spelling of 6659994 in words is "six million, six hundred fifty-nine thousand, nine hundred ninety-four".