6665158 has 4 divisors (see below), whose sum is σ = 9997740. Its totient is φ = 3332578.

The previous prime is 6665123. The next prime is 6665159. The reversal of 6665158 is 8515666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8515666 = 2 ⋅4257833.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665159) 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 as a sum of consecutive naturals, namely, 1666288 + ... + 1666291.

It is an arithmetic number, because the mean of its divisors is an integer number (2499435).

Almost surely, 2^6665158 is an apocalyptic number.

6665158 is a deficient number, since it is larger than the sum of its proper divisors (3332582).

6665158 is a wasteful number, since it uses less digits than its factorization.

6665158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332581.

The product of its digits is 43200, while the sum is 37.

The square root of 6665158 is about 2581.6967288975. The cubic root of 6665158 is about 188.1930076082.

The spelling of 6665158 in words is "six million, six hundred sixty-five thousand, one hundred fifty-eight".