6669445 has 4 divisors (see below), whose sum is σ = 8003340. Its totient is φ = 5335552.

The previous prime is 6669413. The next prime is 6669451. The reversal of 6669445 is 5449666.

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 749956 + 5919489 = 866^2 + 2433^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669445 - 2⁵ = 6669413 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6669398 and 6669407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666940 + ... + 666949.

It is an arithmetic number, because the mean of its divisors is an integer number (2000835).

Almost surely, 2^6669445 is an apocalyptic number.

It is an amenable number.

6669445 is a deficient number, since it is larger than the sum of its proper divisors (1333895).

6669445 is a wasteful number, since it uses less digits than its factorization.

6669445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333894.

The product of its digits is 155520, while the sum is 40.

The square root of 6669445 is about 2582.5268633646. The cubic root of 6669445 is about 188.2333472627.

The spelling of 6669445 in words is "six million, six hundred sixty-nine thousand, four hundred forty-five".