646630223 has 2 divisors, whose sum is σ = 646630224. Its totient is φ = 646630222.

The previous prime is 646630181. The next prime is 646630253. The reversal of 646630223 is 322036646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646630223 - 2¹⁴ = 646613839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646630223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646630253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323315111 + 323315112.

It is an arithmetic number, because the mean of its divisors is an integer number (323315112).

Almost surely, 2^646630223 is an apocalyptic number.

646630223 is a deficient number, since it is larger than the sum of its proper divisors (1).

646630223 is an equidigital number, since it uses as much as digits as its factorization.

646630223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 646630223 is about 25428.9249281207. The cubic root of 646630223 is about 864.7395712148.

Adding to 646630223 its reverse (322036646), we get a palindrome (968666869).

The spelling of 646630223 in words is "six hundred forty-six million, six hundred thirty thousand, two hundred twenty-three".