669155 has 4 divisors (see below), whose sum is σ = 802992. Its totient is φ = 535320.

The previous prime is 669133. The next prime is 669167. The reversal of 669155 is 551966.

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

It is not a de Polignac number, because 669155 - 2⁶ = 669091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66911 + ... + 66920.

It is an arithmetic number, because the mean of its divisors is an integer number (200748).

2⁶⁶⁹¹⁵⁵ is an apocalyptic number.

669155 is a deficient number, since it is larger than the sum of its proper divisors (133837).

669155 is a wasteful number, since it uses less digits than its factorization.

669155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133836.

The product of its digits is 8100, while the sum is 32.

The square root of 669155 is about 818.0189484358. The cubic root of 669155 is about 87.4665994969.

The spelling of 669155 in words is "six hundred sixty-nine thousand, one hundred fifty-five".