665479 has 2 divisors, whose sum is σ = 665480. Its totient is φ = 665478.

The previous prime is 665447. The next prime is 665501. The reversal of 665479 is 974566.

665479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665479 - 2⁵ = 665447 is a prime.

It is a Chen prime.

665479 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332739 + 332740.

It is an arithmetic number, because the mean of its divisors is an integer number (332740).

2⁶⁶⁵⁴⁷⁹ is an apocalyptic number.

665479 is a deficient number, since it is larger than the sum of its proper divisors (1).

665479 is an equidigital number, since it uses as much as digits as its factorization.

665479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 665479 is about 815.7689623907. The cubic root of 665479 is about 87.3061395174.

The spelling of 665479 in words is "six hundred sixty-five thousand, four hundred seventy-nine".