6664775 has 12 divisors (see below), whose sum is σ = 8900472. Its totient is φ = 4921440.

The previous prime is 6664771. The next prime is 6664787. The reversal of 6664775 is 5774666.

It is not a de Polignac number, because 6664775 - 2² = 6664771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9929 + ... + 10578.

It is an arithmetic number, because the mean of its divisors is an integer number (741706).

Almost surely, 2^6664775 is an apocalyptic number.

6664775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6664775 is a deficient number, since it is larger than the sum of its proper divisors (2235697).

6664775 is a wasteful number, since it uses less digits than its factorization.

6664775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20530 (or 20525 counting only the distinct ones).

The product of its digits is 211680, while the sum is 41.

The square root of 6664775 is about 2581.6225518073. The cubic root of 6664775 is about 188.1894028274.

The spelling of 6664775 in words is "six million, six hundred sixty-four thousand, seven hundred seventy-five".