661108 has 18 divisors (see below), whose sum is σ = 1346226. Its totient is φ = 283248.

The previous prime is 661103. The next prime is 661109. The reversal of 661108 is 801166.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 1764 = 812^2 + 42^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1491 + ... + 1882.

2⁶⁶¹¹⁰⁸ is an apocalyptic number.

It is an amenable number.

661108 is an abundant number, since it is smaller than the sum of its proper divisors (685118).

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

661108 is a wasteful number, since it uses less digits than its factorization.

661108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391 (or 3382 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 661108 is about 813.0854813610. The cubic root of 661108 is about 87.1145713856.

The spelling of 661108 in words is "six hundred sixty-one thousand, one hundred eight".