6669919 has 4 divisors (see below), whose sum is σ = 6675160. Its totient is φ = 6664680.

The previous prime is 6669907. The next prime is 6669947. The reversal of 6669919 is 9199666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6669919 - 2¹³ = 6661727 is a prime.

It is a super-2 number, since 2×6669919² = 88975638933122, 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 (6669959) 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, 649 + ... + 3709.

It is an arithmetic number, because the mean of its divisors is an integer number (1668790).

Almost surely, 2^6669919 is an apocalyptic number.

6669919 is a deficient number, since it is larger than the sum of its proper divisors (5241).

6669919 is a wasteful number, since it uses less digits than its factorization.

6669919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240.

The product of its digits is 157464, while the sum is 46.

The square root of 6669919 is about 2582.6186323188. The cubic root of 6669919 is about 188.2378064290.

It can be divided in two parts, 666 and 9919, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 6669919 in words is "six million, six hundred sixty-nine thousand, nine hundred nineteen".