666674517 has 4 divisors (see below), whose sum is σ = 888899360. Its totient is φ = 444449676.

The previous prime is 666674497. The next prime is 666674531. The reversal of 666674517 is 715476666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 666674517 - 2¹⁰ = 666673493 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 (666674587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111112417 + ... + 111112422.

It is an arithmetic number, because the mean of its divisors is an integer number (222224840).

Almost surely, 2^666674517 is an apocalyptic number.

It is an amenable number.

666674517 is a deficient number, since it is larger than the sum of its proper divisors (222224843).

666674517 is a wasteful number, since it uses less digits than its factorization.

666674517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222224842.

The product of its digits is 1270080, while the sum is 48.

The square root of 666674517 is about 25820.0409953199. The cubic root of 666674517 is about 873.5838936718.

The spelling of 666674517 in words is "six hundred sixty-six million, six hundred seventy-four thousand, five hundred seventeen".