655666 has 8 divisors (see below), whose sum is σ = 1072944. Its totient is φ = 298020.

The previous prime is 655657. The next prime is 655687. The reversal of 655666 is 666556.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14880 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (134118).

2⁶⁵⁵⁶⁶⁶ is an apocalyptic number.

655666 is a deficient number, since it is larger than the sum of its proper divisors (417278).

655666 is a wasteful number, since it uses less digits than its factorization.

655666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29816.

The product of its digits is 32400, while the sum is 34.

The square root of 655666 is about 809.7320544476. The cubic root of 655666 is about 86.8748806996.

The spelling of 655666 in words is "six hundred fifty-five thousand, six hundred sixty-six".