6668945 has 8 divisors (see below), whose sum is σ = 8048040. Its totient is φ = 5304960.

The previous prime is 6668939. The next prime is 6668951. The reversal of 6668945 is 5498666.

It is an interprime number because it is at equal distance from previous prime (6668939) and next prime (6668951).

It can be written as a sum of positive squares in 4 ways, for example, as 358801 + 6310144 = 599^2 + 2512^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6668945 - 2⁶ = 6668881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6668896 and 6668905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2780 + ... + 4589.

It is an arithmetic number, because the mean of its divisors is an integer number (1006005).

Almost surely, 2^6668945 is an apocalyptic number.

It is an amenable number.

6668945 is a deficient number, since it is larger than the sum of its proper divisors (1379095).

6668945 is a wasteful number, since it uses less digits than its factorization.

6668945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7555.

The product of its digits is 311040, while the sum is 44.

The square root of 6668945 is about 2582.4300571361. The cubic root of 6668945 is about 188.2286432718.

The spelling of 6668945 in words is "six million, six hundred sixty-eight thousand, nine hundred forty-five".