665195 has 4 divisors (see below), whose sum is σ = 798240. Its totient is φ = 532152.

The previous prime is 665179. The next prime is 665201. The reversal of 665195 is 591566.

665195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 665195 - 2⁴ = 665179 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66515 + ... + 66524.

It is an arithmetic number, because the mean of its divisors is an integer number (199560).

2⁶⁶⁵¹⁹⁵ is an apocalyptic number.

665195 is a deficient number, since it is larger than the sum of its proper divisors (133045).

665195 is a wasteful number, since it uses less digits than its factorization.

665195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133044.

The product of its digits is 8100, while the sum is 32.

The square root of 665195 is about 815.5948749226. The cubic root of 665195 is about 87.2937181529.

It can be divided in two parts, 6 and 65195, that multiplied together give a triangular number (391170 = T₈₈₄).

The spelling of 665195 in words is "six hundred sixty-five thousand, one hundred ninety-five".