666287917 has 8 divisors (see below), whose sum is σ = 672264320. Its totient is φ = 660337920.

The previous prime is 666287911. The next prime is 666287957. The reversal of 666287917 is 719782666.

It is a happy number.

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

It is not a de Polignac number, because 666287917 - 2¹¹ = 666285869 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 (666287911) 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, 45934 + ... + 58672.

It is an arithmetic number, because the mean of its divisors is an integer number (84033040).

Almost surely, 2^666287917 is an apocalyptic number.

It is an amenable number.

666287917 is a deficient number, since it is larger than the sum of its proper divisors (5976403).

666287917 is a wasteful number, since it uses less digits than its factorization.

666287917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13203.

The product of its digits is 1524096, while the sum is 52.

The square root of 666287917 is about 25812.5534769422. The cubic root of 666287917 is about 873.4149992424.

The spelling of 666287917 in words is "six hundred sixty-six million, two hundred eighty-seven thousand, nine hundred seventeen".