6641999 has 12 divisors (see below), whose sum is σ = 8321544. Its totient is φ = 5254704.

The previous prime is 6641983. The next prime is 6642007. The reversal of 6641999 is 9991466.

It is not a de Polignac number, because 6641999 - 2⁴ = 6641983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641969) 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, 4577 + ... + 5850.

It is an arithmetic number, because the mean of its divisors is an integer number (693462).

Almost surely, 2^6641999 is an apocalyptic number.

6641999 is a deficient number, since it is larger than the sum of its proper divisors (1679545).

6641999 is a wasteful number, since it uses less digits than its factorization.

6641999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454 (or 10447 counting only the distinct ones).

The product of its digits is 104976, while the sum is 44.

The square root of 6641999 is about 2577.2075973813. The cubic root of 6641999 is about 187.9747872481.

The spelling of 6641999 in words is "six million, six hundred forty-one thousand, nine hundred ninety-nine".