667655 has 8 divisors (see below), whose sum is σ = 813552. Its totient is φ = 525888.

The previous prime is 667649. The next prime is 667657. The reversal of 667655 is 556766.

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

It is a cyclic number.

It is not a de Polignac number, because 667655 - 2¹⁴ = 651271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667655.

It is not an unprimeable number, because it can be changed into a prime (667657) 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 7 ways as a sum of consecutive naturals, for example, 662 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (101694).

2⁶⁶⁷⁶⁵⁵ is an apocalyptic number.

667655 is a deficient number, since it is larger than the sum of its proper divisors (145897).

667655 is a wasteful number, since it uses less digits than its factorization.

667655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065.

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

The square root of 667655 is about 817.1015848718. The cubic root of 667655 is about 87.4011945929.

Subtracting from 667655 its reverse (556766), we obtain a square (110889 = 333²).

The spelling of 667655 in words is "six hundred sixty-seven thousand, six hundred fifty-five".