665107 has 4 divisors (see below), whose sum is σ = 676440. Its totient is φ = 653776.

The previous prime is 665089. The next prime is 665111. The reversal of 665107 is 701566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 701566 = 2 ⋅350783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665107 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (665117) 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, 5578 + ... + 5695.

It is an arithmetic number, because the mean of its divisors is an integer number (169110).

2⁶⁶⁵¹⁰⁷ is an apocalyptic number.

665107 is a deficient number, since it is larger than the sum of its proper divisors (11333).

665107 is a wasteful number, since it uses less digits than its factorization.

665107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11332.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 665107 is about 815.5409247855. The cubic root of 665107 is about 87.2898685620.

The spelling of 665107 in words is "six hundred sixty-five thousand, one hundred seven".