666775506 has 16 divisors (see below), whose sum is σ = 1355413248. Its totient is φ = 218614800.

The previous prime is 666775489. The next prime is 666775507. The reversal of 666775506 is 605577666.

It is not an unprimeable number, because it can be changed into a prime (666775507) 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 7 ways as a sum of consecutive naturals, for example, 910530 + ... + 911261.

It is an arithmetic number, because the mean of its divisors is an integer number (84713328).

Almost surely, 2^666775506 is an apocalyptic number.

666775506 is an abundant number, since it is smaller than the sum of its proper divisors (688637742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666775506 is a wasteful number, since it uses less digits than its factorization.

666775506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821857.

The product of its (nonzero) digits is 1587600, while the sum is 48.

The square root of 666775506 is about 25821.9965533264. The cubic root of 666775506 is about 873.6280021071.

The spelling of 666775506 in words is "six hundred sixty-six million, seven hundred seventy-five thousand, five hundred six".