667099 has 4 divisors (see below), whose sum is σ = 668736. Its totient is φ = 665464.

The previous prime is 667091. The next prime is 667103. The reversal of 667099 is 990766.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 667099 - 2³ = 667091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667091) 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, 342 + ... + 1204.

It is an arithmetic number, because the mean of its divisors is an integer number (167184).

2⁶⁶⁷⁰⁹⁹ is an apocalyptic number.

667099 is a deficient number, since it is larger than the sum of its proper divisors (1637).

667099 is an equidigital number, since it uses as much as digits as its factorization.

667099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 667099 is about 816.7612870356. The cubic root of 667099 is about 87.3769262907.

The spelling of 667099 in words is "six hundred sixty-seven thousand, ninety-nine".