666140224 has 28 divisors (see below), whose sum is σ = 1322893468. Its totient is φ = 332812800.

The previous prime is 666140213. The next prime is 666140227. The reversal of 666140224 is 422041666.

666140224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 350438400 + 315701824 = 18720^2 + 17768^2 .

It is not an unprimeable number, because it can be changed into a prime (666140227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100534 + ... + 106954.

Almost surely, 2^666140224 is an apocalyptic number.

666140224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

666140224 is a deficient number, since it is larger than the sum of its proper divisors (656753244).

666140224 is a wasteful number, since it uses less digits than its factorization.

666140224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054 (or 8044 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 666140224 is about 25809.6924429564. The cubic root of 666140224 is about 873.3504591686.

The spelling of 666140224 in words is "six hundred sixty-six million, one hundred forty thousand, two hundred twenty-four".