669099 has 8 divisors (see below), whose sum is σ = 896512. Its totient is φ = 443880.

The previous prime is 669091. The next prime is 669107. The reversal of 669099 is 990966.

It is an interprime number because it is at equal distance from previous prime (669091) and next prime (669107).

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

It is not a de Polignac number, because 669099 - 2³ = 669091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669091) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 402 + ... + 1224.

It is an arithmetic number, because the mean of its divisors is an integer number (112064).

2⁶⁶⁹⁰⁹⁹ is an apocalyptic number.

669099 is a deficient number, since it is larger than the sum of its proper divisors (227413).

669099 is a wasteful number, since it uses less digits than its factorization.

669099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 669099 is about 817.9847186837. The cubic root of 669099 is about 87.4641594712.

The spelling of 669099 in words is "six hundred sixty-nine thousand, ninety-nine".