667540223 has 4 divisors (see below), whose sum is σ = 762903120. Its totient is φ = 572177328.

The previous prime is 667540217. The next prime is 667540259. The reversal of 667540223 is 322045766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667540223 - 2²² = 663345919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667540723) 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, 47681438 + ... + 47681451.

It is an arithmetic number, because the mean of its divisors is an integer number (190725780).

Almost surely, 2^667540223 is an apocalyptic number.

667540223 is a deficient number, since it is larger than the sum of its proper divisors (95362897).

667540223 is an equidigital number, since it uses as much as digits as its factorization.

667540223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95362896.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 667540223 is about 25836.7997824808. The cubic root of 667540223 is about 873.9618590739.

Adding to 667540223 its reverse (322045766), we get a palindrome (989585989).

The spelling of 667540223 in words is "six hundred sixty-seven million, five hundred forty thousand, two hundred twenty-three".