667855 has 4 divisors (see below), whose sum is σ = 801432. Its totient is φ = 534280.

The previous prime is 667837. The next prime is 667859. The reversal of 667855 is 558766.

667855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 667855 - 2⁷ = 667727 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667859) 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, 66781 + ... + 66790.

It is an arithmetic number, because the mean of its divisors is an integer number (200358).

2⁶⁶⁷⁸⁵⁵ is an apocalyptic number.

667855 is a deficient number, since it is larger than the sum of its proper divisors (133577).

667855 is a wasteful number, since it uses less digits than its factorization.

667855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133576.

The product of its digits is 50400, while the sum is 37.

The square root of 667855 is about 817.2239595117. The cubic root of 667855 is about 87.4099209031.

It can be divided in two parts, 66 and 7855, that added together give a square (7921 = 89²).

The spelling of 667855 in words is "six hundred sixty-seven thousand, eight hundred fifty-five".