669156 has 12 divisors (see below), whose sum is σ = 1561392. Its totient is φ = 223048.

The previous prime is 669133. The next prime is 669167. The reversal of 669156 is 651966.

669156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

669156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27870 + ... + 27893.

It is an arithmetic number, because the mean of its divisors is an integer number (130116).

2⁶⁶⁹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

669156 is an abundant number, since it is smaller than the sum of its proper divisors (892236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669156 is a wasteful number, since it uses less digits than its factorization.

669156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55770 (or 55768 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 669156 is about 818.0195596683. The cubic root of 669156 is about 87.4666430675.

Adding to 669156 its product of digits (9720), we get a palindrome (678876).

The spelling of 669156 in words is "six hundred sixty-nine thousand, one hundred fifty-six".