646220341243 has 2 divisors, whose sum is σ = 646220341244. Its totient is φ = 646220341242.

The previous prime is 646220341223. The next prime is 646220341387. The reversal of 646220341243 is 342143022646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646220341243 - 2⁵ = 646220341211 is a prime.

It is not a weakly prime, because it can be changed into another prime (646220341213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323110170621 + 323110170622.

It is an arithmetic number, because the mean of its divisors is an integer number (323110170622).

Almost surely, 2^646220341243 is an apocalyptic number.

646220341243 is a deficient number, since it is larger than the sum of its proper divisors (1).

646220341243 is an equidigital number, since it uses as much as digits as its factorization.

646220341243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 37.

Adding to 646220341243 its reverse (342143022646), we get a palindrome (988363363889).

The spelling of 646220341243 in words is "six hundred forty-six billion, two hundred twenty million, three hundred forty-one thousand, two hundred forty-three".