6669999 has 16 divisors (see below), whose sum is σ = 11293440. Its totient is φ = 3811320.

The previous prime is 6669983. The next prime is 6670019. The reversal of 6669999 is 9999666.

It is not a de Polignac number, because 6669999 - 2⁴ = 6669983 is a prime.

6669999 is a modest number, since divided by 9999 gives 666 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17457 + ... + 17834.

It is an arithmetic number, because the mean of its divisors is an integer number (705840).

Almost surely, 2^6669999 is an apocalyptic number.

6669999 is a deficient number, since it is larger than the sum of its proper divisors (4623441).

6669999 is a wasteful number, since it uses less digits than its factorization.

6669999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35307 (or 35301 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 6669999 is about 2582.6341204282. The cubic root of 6669999 is about 188.2385590101.

The spelling of 6669999 in words is "six million, six hundred sixty-nine thousand, nine hundred ninety-nine".