666140222 has 16 divisors (see below), whose sum is σ = 1094079744. Its totient is φ = 301671000.

The previous prime is 666140213. The next prime is 666140227. The reversal of 666140222 is 222041666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666140227) 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, 49904 + ... + 61827.

It is an arithmetic number, because the mean of its divisors is an integer number (68379984).

Almost surely, 2^666140222 is an apocalyptic number.

666140222 is a deficient number, since it is larger than the sum of its proper divisors (427939522).

666140222 is a wasteful number, since it uses less digits than its factorization.

666140222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112015.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 666140222 is about 25809.6924042113. The cubic root of 666140222 is about 873.3504582946.

Adding to 666140222 its reverse (222041666), we get a palindrome (888181888).

The spelling of 666140222 in words is "six hundred sixty-six million, one hundred forty thousand, two hundred twenty-two".