6666490 has 8 divisors (see below), whose sum is σ = 11999700. Its totient is φ = 2666592.

The previous prime is 6666487. The next prime is 6666509. The reversal of 6666490 is 946666.

It can be written as a sum of positive squares in 2 ways, for example, as 5890329 + 776161 = 2427^2 + 881^2 .

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

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, 333315 + ... + 333334.

Almost surely, 2^6666490 is an apocalyptic number.

6666490 is a deficient number, since it is larger than the sum of its proper divisors (5333210).

6666490 is a wasteful number, since it uses less digits than its factorization.

6666490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666656.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 6666490 is about 2581.9546858921. The cubic root of 6666490 is about 188.2055432645.

The spelling of 6666490 in words is "six million, six hundred sixty-six thousand, four hundred ninety".