666441479 has 8 divisors (see below), whose sum is σ = 727264272. Its totient is φ = 605658240.

The previous prime is 666441443. The next prime is 666441487. The reversal of 666441479 is 974144666.

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

It is not a de Polignac number, because 666441479 - 2²⁴ = 649664263 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 (666441079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33737 + ... + 49709.

It is an arithmetic number, because the mean of its divisors is an integer number (90908034).

Almost surely, 2^666441479 is an apocalyptic number.

666441479 is a deficient number, since it is larger than the sum of its proper divisors (60822793).

666441479 is a wasteful number, since it uses less digits than its factorization.

666441479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19777.

The product of its digits is 870912, while the sum is 47.

The square root of 666441479 is about 25815.5278659957. The cubic root of 666441479 is about 873.4820938863.

The spelling of 666441479 in words is "six hundred sixty-six million, four hundred forty-one thousand, four hundred seventy-nine".