6664499 has 4 divisors (see below), whose sum is σ = 6693336. Its totient is φ = 6635664.

The previous prime is 6664481. The next prime is 6664501. The reversal of 6664499 is 9944666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9944666 = 2 ⋅4972333.

It is a cyclic number.

It is not a de Polignac number, because 6664499 - 2²⁰ = 5615923 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6664429) 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, 14069 + ... + 14534.

It is an arithmetic number, because the mean of its divisors is an integer number (1673334).

Almost surely, 2^6664499 is an apocalyptic number.

6664499 is a deficient number, since it is larger than the sum of its proper divisors (28837).

6664499 is a wasteful number, since it uses less digits than its factorization.

6664499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28836.

The product of its digits is 279936, while the sum is 44.

The square root of 6664499 is about 2581.5690964993. The cubic root of 6664499 is about 188.1868050406.

The spelling of 6664499 in words is "six million, six hundred sixty-four thousand, four hundred ninety-nine".