661210 has 16 divisors (see below), whose sum is σ = 1298592. Its totient is φ = 240400.

The previous prime is 661201. The next prime is 661217. The reversal of 661210 is 12166.

661210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661217) by changing a digit.

661210 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 7 ways as a sum of consecutive naturals, for example, 2896 + ... + 3115.

It is an arithmetic number, because the mean of its divisors is an integer number (81162).

2⁶⁶¹²¹⁰ is an apocalyptic number.

661210 is a deficient number, since it is larger than the sum of its proper divisors (637382).

661210 is a wasteful number, since it uses less digits than its factorization.

661210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6029.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 661210 is about 813.1482029741. The cubic root of 661210 is about 87.1190513542.

Adding to 661210 its reverse (12166), we get a palindrome (673376).

It can be divided in two parts, 6 and 61210, that added together give a palindrome (61216).

The spelling of 661210 in words is "six hundred sixty-one thousand, two hundred ten".