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664111 = 794873
BaseRepresentation
bin10100010001000101111
31020201222201
42202020233
5132222421
622122331
75434120
oct2421057
91221881
10664111
11413a58
122803a7
131a3386
14134047
15d1b91
hexa222f

664111 has 4 divisors (see below), whose sum is σ = 758992. Its totient is φ = 569232.

The previous prime is 664109. The next prime is 664117. The reversal of 664111 is 111466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111466 = 255733.

It is a cyclic number.

It is not a de Polignac number, because 664111 - 21 = 664109 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47430 + ... + 47443.

It is an arithmetic number, because the mean of its divisors is an integer number (189748).

2664111 is an apocalyptic number.

664111 is the 471-st hex number.

664111 is a deficient number, since it is larger than the sum of its proper divisors (94881).

664111 is an equidigital number, since it uses as much as digits as its factorization.

664111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94880.

The product of its digits is 144, while the sum is 19.

The square root of 664111 is about 814.9300583486. The cubic root of 664111 is about 87.2462745021.

Adding to 664111 its reverse (111466), we get a palindrome (775577).

The spelling of 664111 in words is "six hundred sixty-four thousand, one hundred eleven".

Divisors: 1 7 94873 664111