6664895 has 4 divisors (see below), whose sum is σ = 7997880. Its totient is φ = 5331912.

The previous prime is 6664891. The next prime is 6664937. The reversal of 6664895 is 5984666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5984666 = 2 ⋅2992333.

It is a cyclic number.

It is not a de Polignac number, because 6664895 - 2² = 6664891 is a prime.

It is a super-2 number, since 2×6664895² = 88841650722050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664891) 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, 666485 + ... + 666494.

It is an arithmetic number, because the mean of its divisors is an integer number (1999470).

Almost surely, 2^6664895 is an apocalyptic number.

6664895 is a deficient number, since it is larger than the sum of its proper divisors (1332985).

6664895 is a wasteful number, since it uses less digits than its factorization.

6664895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332984.

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

The square root of 6664895 is about 2581.6457929003. The cubic root of 6664895 is about 188.1905322775.

The spelling of 6664895 in words is "six million, six hundred sixty-four thousand, eight hundred ninety-five".