665145 has 32 divisors (see below), whose sum is σ = 1276800. Its totient is φ = 326592.

The previous prime is 665141. The next prime is 665153. The reversal of 665145 is 541566.

665145 = 24³ + 25³ + ... + 41³.

It is a happy number.

665145 is a `hidden beast` number, since 6 + 651 + 4 + 5 = 666.

It is not a de Polignac number, because 665145 - 2² = 665141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (3600) is a multiple of the sum of its prime divisors (400).

665145 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665145.

It is not an unprimeable number, because it can be changed into a prime (665141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1566 + ... + 1944.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2⁶⁶⁵¹⁴⁵ is an apocalyptic number.

665145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

665145 is a deficient number, since it is larger than the sum of its proper divisors (611655).

665145 is a wasteful number, since it uses less digits than its factorization.

665145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 400 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 665145 is about 815.5642218734. The cubic root of 665145 is about 87.2915309270.

The spelling of 665145 in words is "six hundred sixty-five thousand, one hundred forty-five".