6664899 has 4 divisors (see below), whose sum is σ = 8886536. Its totient is φ = 4443264.

The previous prime is 6664891. The next prime is 6664937. The reversal of 6664899 is 9984666.

6664899 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6664899 - 2³ = 6664891 is a prime.

It is a D-number.

It is a Duffinian 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, 1110814 + ... + 1110819.

It is an arithmetic number, because the mean of its divisors is an integer number (2221634).

Almost surely, 2^6664899 is an apocalyptic number.

6664899 is a deficient number, since it is larger than the sum of its proper divisors (2221637).

6664899 is a wasteful number, since it uses less digits than its factorization.

6664899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221636.

The product of its digits is 559872, while the sum is 48.

The square root of 6664899 is about 2581.6465675998. The cubic root of 6664899 is about 188.1905699256.

It can be divided in two parts, 666 and 4899, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 6664899 in words is "six million, six hundred sixty-four thousand, eight hundred ninety-nine".