646306102243 has 2 divisors, whose sum is σ = 646306102244. Its totient is φ = 646306102242.

The previous prime is 646306102237. The next prime is 646306102283. The reversal of 646306102243 is 342201603646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646306102243 - 2²¹ = 646304005091 is a prime.

It is not a weakly prime, because it can be changed into another prime (646306102223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323153051121 + 323153051122.

It is an arithmetic number, because the mean of its divisors is an integer number (323153051122).

Almost surely, 2^646306102243 is an apocalyptic number.

646306102243 is a deficient number, since it is larger than the sum of its proper divisors (1).

646306102243 is an equidigital number, since it uses as much as digits as its factorization.

646306102243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 37.

Adding to 646306102243 its reverse (342201603646), we get a palindrome (988507705889).

The spelling of 646306102243 in words is "six hundred forty-six billion, three hundred six million, one hundred two thousand, two hundred forty-three".