661060 has 12 divisors (see below), whose sum is σ = 1388268. Its totient is φ = 264416.

The previous prime is 661049. The next prime is 661061. The reversal of 661060 is 60166.

It is a happy number.

661060 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in 2 ways, for example, as 407044 + 254016 = 638^2 + 504^2 .

It is not an unprimeable number, because it can be changed into a prime (661061) 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 3 ways as a sum of consecutive naturals, for example, 16507 + ... + 16546.

It is an arithmetic number, because the mean of its divisors is an integer number (115689).

2⁶⁶¹⁰⁶⁰ is an apocalyptic number.

It is an amenable number.

661060 is an abundant number, since it is smaller than the sum of its proper divisors (727208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661060 is a wasteful number, since it uses less digits than its factorization.

661060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33062 (or 33060 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 661060 is about 813.0559636335. The cubic root of 661060 is about 87.1124630056.

It can be divided in two parts, 6610 and 60, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 661060 in words is "six hundred sixty-one thousand, sixty".