661310 has 16 divisors (see below), whose sum is σ = 1282176. Its totient is φ = 244128.

The previous prime is 661267. The next prime is 661321. The reversal of 661310 is 13166.

It is a super-2 number, since 2×661310² = 874661832200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2414 + ... + 2673.

It is an arithmetic number, because the mean of its divisors is an integer number (80136).

2⁶⁶¹³¹⁰ is an apocalyptic number.

661310 is a deficient number, since it is larger than the sum of its proper divisors (620866).

661310 is a wasteful number, since it uses less digits than its factorization.

661310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 661310 is about 813.2096900554. The cubic root of 661310 is about 87.1234430331.

Adding to 661310 its reverse (13166), we get a palindrome (674476).

It can be divided in two parts, 6 and 61310, that added together give a palindrome (61316).

The spelling of 661310 in words is "six hundred sixty-one thousand, three hundred ten".