661160 has 16 divisors (see below), whose sum is σ = 1487700. Its totient is φ = 264448.

The previous prime is 661139. The next prime is 661183. The reversal of 661160 is 61166.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 17956 = 802^2 + 134^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

661160 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 3 ways as a sum of consecutive naturals, for example, 8225 + ... + 8304.

2⁶⁶¹¹⁶⁰ is an apocalyptic number.

It is an amenable number.

661160 is an abundant number, since it is smaller than the sum of its proper divisors (826540).

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

661160 is a wasteful number, since it uses less digits than its factorization.

661160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16540 (or 16536 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 661160 is about 813.1174576898. The cubic root of 661160 is about 87.1168553488.

The spelling of 661160 in words is "six hundred sixty-one thousand, one hundred sixty".