665522 has 24 divisors (see below), whose sum is σ = 1185840.
Its totient is φ = 277680.
The previous prime is 665507. The next prime is 665527. The reversal of 665522 is 225566.
It is a happy number.
665522 is nontrivially palindromic in base 12.
665522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a Harshad number since it is a multiple of its sum of digits (26).
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 665491 and 665500.
It is not an unprimeable number, because it can be changed into a prime (665527) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3629 + ... + 3807.
It is an arithmetic number, because the mean of its divisors is an integer number (49410).
2665522 is an apocalyptic number.
665522 is a deficient number, since it is larger than the sum of its proper divisors (520318).
665522 is a wasteful number, since it uses less digits than its factorization.
665522 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 218 (or 205 counting only the distinct ones).
The product of its digits is 3600, while the sum is 26.
The square root of 665522 is about 815.7953174663.
The cubic root of 665522 is about 87.3080199089.
The spelling of 665522 in words is "six hundred sixty-five thousand, five hundred twenty-two".