666704506 has 16 divisors (see below), whose sum is σ = 1080672264. Its totient is φ = 306656064.

The previous prime is 666704501. The next prime is 666704513. The reversal of 666704506 is 605407666.

It can be written as a sum of positive squares in 4 ways, for example, as 467640625 + 199063881 = 21625^2 + 14109^2 .

It is not an unprimeable number, because it can be changed into a prime (666704501) 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, 36141 + ... + 51376.

Almost surely, 2^666704506 is an apocalyptic number.

666704506 is a deficient number, since it is larger than the sum of its proper divisors (413967758).

666704506 is a wasteful number, since it uses less digits than its factorization.

666704506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87825.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 666704506 is about 25820.6217198579. The cubic root of 666704506 is about 873.5969922748.

The spelling of 666704506 in words is "six hundred sixty-six million, seven hundred four thousand, five hundred six".