664145 has 8 divisors (see below), whose sum is σ = 839040. Its totient is φ = 503280.

The previous prime is 664141. The next prime is 664151. The reversal of 664145 is 541466.

It is a happy number.

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

It is not a de Polignac number, because 664145 - 2² = 664141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3401 + ... + 3590.

It is an arithmetic number, because the mean of its divisors is an integer number (104880).

2⁶⁶⁴¹⁴⁵ is an apocalyptic number.

It is an amenable number.

664145 is a deficient number, since it is larger than the sum of its proper divisors (174895).

664145 is a wasteful number, since it uses less digits than its factorization.

664145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015.

The product of its digits is 2880, while the sum is 26.

The square root of 664145 is about 814.9509187675. The cubic root of 664145 is about 87.2477633710.

The spelling of 664145 in words is "six hundred sixty-four thousand, one hundred forty-five".