666140223 has 16 divisors (see below), whose sum is σ = 1074781440. Its totient is φ = 358260096.

The previous prime is 666140213. The next prime is 666140227. The reversal of 666140223 is 322041666.

It is not a de Polignac number, because 666140223 - 2⁶ = 666140159 is a prime.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 932613 + ... + 933326.

It is an arithmetic number, because the mean of its divisors is an integer number (67173840).

Almost surely, 2^666140223 is an apocalyptic number.

666140223 is a deficient number, since it is larger than the sum of its proper divisors (408641217).

666140223 is a wasteful number, since it uses less digits than its factorization.

666140223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865966.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 666140223 is about 25809.6924235838. The cubic root of 666140223 is about 873.3504587316.

Adding to 666140223 its reverse (322041666), we get a palindrome (988181889).

The spelling of 666140223 in words is "six hundred sixty-six million, one hundred forty thousand, two hundred twenty-three".