666479 has 4 divisors (see below), whose sum is σ = 727080. Its totient is φ = 605880.

The previous prime is 666467. The next prime is 666493. The reversal of 666479 is 974666.

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

It is a de Polignac number, because none of the positive numbers 2^k-666479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666439) 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, 30284 + ... + 30305.

It is an arithmetic number, because the mean of its divisors is an integer number (181770).

2⁶⁶⁶⁴⁷⁹ is an apocalyptic number.

666479 is a deficient number, since it is larger than the sum of its proper divisors (60601).

666479 is a wasteful number, since it uses less digits than its factorization.

666479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60600.

The product of its digits is 54432, while the sum is 38.

The square root of 666479 is about 816.3816509452. The cubic root of 666479 is about 87.3498486077.

The spelling of 666479 in words is "six hundred sixty-six thousand, four hundred seventy-nine".