655667 has 4 divisors (see below), whose sum is σ = 666840. Its totient is φ = 644496.

The previous prime is 655657. The next prime is 655687. The reversal of 655667 is 766556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 655667 - 2⁴ = 655651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655637) 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, 5498 + ... + 5615.

It is an arithmetic number, because the mean of its divisors is an integer number (166710).

2⁶⁵⁵⁶⁶⁷ is an apocalyptic number.

655667 is a deficient number, since it is larger than the sum of its proper divisors (11173).

655667 is a wasteful number, since it uses less digits than its factorization.

655667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172.

The product of its digits is 37800, while the sum is 35.

The square root of 655667 is about 809.7326719356. The cubic root of 655667 is about 86.8749248658.

Subtracting 655667 from its reverse (766556), we obtain a square (110889 = 333²).

The spelling of 655667 in words is "six hundred fifty-five thousand, six hundred sixty-seven".