665355 has 8 divisors (see below), whose sum is σ = 1064592. Its totient is φ = 354848.

The previous prime is 665351. The next prime is 665359. The reversal of 665355 is 553566.

It is an interprime number because it is at equal distance from previous prime (665351) and next prime (665359).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665355 - 2² = 665351 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (665351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22164 + ... + 22193.

It is an arithmetic number, because the mean of its divisors is an integer number (133074).

2⁶⁶⁵³⁵⁵ is an apocalyptic number.

665355 is a deficient number, since it is larger than the sum of its proper divisors (399237).

665355 is a wasteful number, since it uses less digits than its factorization.

665355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44365.

The product of its digits is 13500, while the sum is 30.

The square root of 665355 is about 815.6929569391. The cubic root of 665355 is about 87.3007165395.

The spelling of 665355 in words is "six hundred sixty-five thousand, three hundred fifty-five".