6664619 has 4 divisors (see below), whose sum is σ = 7177296. Its totient is φ = 6151944.

The previous prime is 6664607. The next prime is 6664631. The reversal of 6664619 is 9164666.

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

It is an interprime number because it is at equal distance from previous prime (6664607) and next prime (6664631).

It is a cyclic number.

It is not a de Polignac number, because 6664619 - 2¹² = 6660523 is a prime.

It is a super-2 number, since 2×6664619² = 88834292830322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6664019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256319 + ... + 256344.

It is an arithmetic number, because the mean of its divisors is an integer number (1794324).

Almost surely, 2^6664619 is an apocalyptic number.

6664619 is a deficient number, since it is larger than the sum of its proper divisors (512677).

6664619 is a wasteful number, since it uses less digits than its factorization.

6664619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512676.

The product of its digits is 46656, while the sum is 38.

The square root of 6664619 is about 2581.5923380735. The cubic root of 6664619 is about 188.1879345219.

The spelling of 6664619 in words is "six million, six hundred sixty-four thousand, six hundred nineteen".