665356 has 12 divisors (see below), whose sum is σ = 1172080. Its totient is φ = 330480.

The previous prime is 665351. The next prime is 665359. The reversal of 665356 is 653566.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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.

665356 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265 + ... + 1183.

2⁶⁶⁵³⁵⁶ is an apocalyptic number.

It is an amenable number.

665356 is a deficient number, since it is larger than the sum of its proper divisors (506724).

665356 is a wasteful number, since it uses less digits than its factorization.

665356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104 (or 1102 counting only the distinct ones).

The product of its digits is 16200, while the sum is 31.

The square root of 665356 is about 815.6935699146. The cubic root of 665356 is about 87.3007602759.

The spelling of 665356 in words is "six hundred sixty-five thousand, three hundred fifty-six".