666563530 has 8 divisors (see below), whose sum is σ = 1199814372. Its totient is φ = 266625408.

The previous prime is 666563479. The next prime is 666563537. The reversal of 666563530 is 35365666.

It can be written as a sum of positive squares in 2 ways, for example, as 573267249 + 93296281 = 23943^2 + 9659^2 .

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

It is not an unprimeable number, because it can be changed into a prime (666563537) 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, 33328167 + ... + 33328186.

Almost surely, 2^666563530 is an apocalyptic number.

666563530 is a deficient number, since it is larger than the sum of its proper divisors (533250842).

666563530 is a wasteful number, since it uses less digits than its factorization.

666563530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66656360.

The product of its (nonzero) digits is 291600, while the sum is 40.

The square root of 666563530 is about 25817.8916645027. The cubic root of 666563530 is about 873.5354133244.

The spelling of 666563530 in words is "six hundred sixty-six million, five hundred sixty-three thousand, five hundred thirty".