666189256 has 32 divisors (see below), whose sum is σ = 1292417280. Its totient is φ = 321595200.

The previous prime is 666189253. The next prime is 666189259. The reversal of 666189256 is 652981666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666189253) and next prime (666189259).

It is not an unprimeable number, because it can be changed into a prime (666189253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111415 + ... + 117241.

It is an arithmetic number, because the mean of its divisors is an integer number (40388040).

Almost surely, 2^666189256 is an apocalyptic number.

It is an amenable number.

666189256 is a deficient number, since it is larger than the sum of its proper divisors (626228024).

666189256 is a wasteful number, since it uses less digits than its factorization.

666189256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325 (or 6321 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 666189256 is about 25810.6423011904. The cubic root of 666189256 is about 873.3718866236.

The spelling of 666189256 in words is "six hundred sixty-six million, one hundred eighty-nine thousand, two hundred fifty-six".