661186 has 8 divisors (see below), whose sum is σ = 995904. Its totient is φ = 329220.

The previous prime is 661183. The next prime is 661187. The reversal of 661186 is 681166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2⁶⁶¹¹⁸⁶ is an apocalyptic number.

661186 is a deficient number, since it is larger than the sum of its proper divisors (334718).

661186 is a wasteful number, since it uses less digits than its factorization.

661186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its digits is 1728, while the sum is 28.

The square root of 661186 is about 813.1334453827. The cubic root of 661186 is about 87.1179972854.

The spelling of 661186 in words is "six hundred sixty-one thousand, one hundred eighty-six".