669699 has 6 divisors (see below), whose sum is σ = 967356. Its totient is φ = 446460.

The previous prime is 669689. The next prime is 669701. The reversal of 669699 is 996966.

It is not a de Polignac number, because 669699 - 2⁵ = 669667 is a prime.

669699 is a strobogrammatic number because it is the same when read upside-down.

669699 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669699.

It is not an unprimeable number, because it can be changed into a prime (669649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37197 + ... + 37214.

It is an arithmetic number, because the mean of its divisors is an integer number (161226).

2⁶⁶⁹⁶⁹⁹ is an apocalyptic number.

669699 is a deficient number, since it is larger than the sum of its proper divisors (297657).

669699 is a wasteful number, since it uses less digits than its factorization.

669699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74417 (or 74414 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 669699 is about 818.3513915183. The cubic root of 669699 is about 87.4902955224.

The spelling of 669699 in words is "six hundred sixty-nine thousand, six hundred ninety-nine".