6618889 has 4 divisors (see below), whose sum is σ = 6626560. Its totient is φ = 6611220.

The previous prime is 6618853. The next prime is 6618901. The reversal of 6618889 is 9888166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9888166 = 2 ⋅4944083.

It is a cyclic number.

It is not a de Polignac number, because 6618889 - 2⁷ = 6618761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6618809) 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, 2349 + ... + 4330.

It is an arithmetic number, because the mean of its divisors is an integer number (1656640).

Almost surely, 2^6618889 is an apocalyptic number.

It is an amenable number.

6618889 is a deficient number, since it is larger than the sum of its proper divisors (7671).

6618889 is an equidigital number, since it uses as much as digits as its factorization.

6618889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7670.

The product of its digits is 165888, while the sum is 46.

The square root of 6618889 is about 2572.7201557884. The cubic root of 6618889 is about 187.7565223682.

The spelling of 6618889 in words is "six million, six hundred eighteen thousand, eight hundred eighty-nine".