6659869 has 4 divisors (see below), whose sum is σ = 7051644. Its totient is φ = 6268096.

The previous prime is 6659843. The next prime is 6659893. The reversal of 6659869 is 9689566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1876900 + 4782969 = 1370^2 + 2187^2 .

It is a cyclic number.

It is not a de Polignac number, because 6659869 - 2¹⁹ = 6135581 is a prime.

It is a super-2 number, since 2×6659869² = 88707710194322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195862 + ... + 195895.

It is an arithmetic number, because the mean of its divisors is an integer number (1762911).

Almost surely, 2^6659869 is an apocalyptic number.

It is an amenable number.

6659869 is a deficient number, since it is larger than the sum of its proper divisors (391775).

6659869 is a wasteful number, since it uses less digits than its factorization.

6659869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391774.

The product of its digits is 699840, while the sum is 49.

The square root of 6659869 is about 2580.6721992535. The cubic root of 6659869 is about 188.1432155296.

The spelling of 6659869 in words is "six million, six hundred fifty-nine thousand, eight hundred sixty-nine".