666047517 has 4 divisors (see below), whose sum is σ = 888063360. Its totient is φ = 444031676.

The previous prime is 666047513. The next prime is 666047533. The reversal of 666047517 is 715740666.

666047517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 666047517 - 2² = 666047513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666047513) 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, 111007917 + ... + 111007922.

It is an arithmetic number, because the mean of its divisors is an integer number (222015840).

Almost surely, 2^666047517 is an apocalyptic number.

It is an amenable number.

666047517 is a deficient number, since it is larger than the sum of its proper divisors (222015843).

666047517 is a wasteful number, since it uses less digits than its factorization.

666047517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222015842.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 666047517 is about 25807.8964078826. The cubic root of 666047517 is about 873.3099424453.

The spelling of 666047517 in words is "six hundred sixty-six million, forty-seven thousand, five hundred seventeen".