667556 has 12 divisors (see below), whose sum is σ = 1237068. Its totient is φ = 314112.

The previous prime is 667553. The next prime is 667559. The reversal of 667556 is 655766.

667556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (667553) and next prime (667559).

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 52900 = 784^2 + 230^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (667553) 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, 4841 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (103089).

2⁶⁶⁷⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

667556 is a deficient number, since it is larger than the sum of its proper divisors (569512).

667556 is a wasteful number, since it uses less digits than its factorization.

667556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838 (or 9836 counting only the distinct ones).

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

The square root of 667556 is about 817.0410026431. The cubic root of 667556 is about 87.3968744246.

The spelling of 667556 in words is "six hundred sixty-seven thousand, five hundred fifty-six".