666286507 has 4 divisors (see below), whose sum is σ = 675670896. Its totient is φ = 656902120.

The previous prime is 666286493. The next prime is 666286519. The reversal of 666286507 is 705682666.

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

It is a cyclic number.

It is not a de Polignac number, because 666286507 - 2²³ = 657897899 is a prime.

It is a super-2 number, since 2×666286507² = 887875418820522098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666286207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4692088 + ... + 4692229.

It is an arithmetic number, because the mean of its divisors is an integer number (168917724).

Almost surely, 2^666286507 is an apocalyptic number.

666286507 is a deficient number, since it is larger than the sum of its proper divisors (9384389).

666286507 is an equidigital number, since it uses as much as digits as its factorization.

666286507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9384388.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 666286507 is about 25812.5261646356. The cubic root of 666286507 is about 873.4143831344.

The spelling of 666286507 in words is "six hundred sixty-six million, two hundred eighty-six thousand, five hundred seven".