646651450579 has 2 divisors, whose sum is σ = 646651450580. Its totient is φ = 646651450578.

The previous prime is 646651450537. The next prime is 646651450631. The reversal of 646651450579 is 975054156646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646651450579 - 2¹³ = 646651442387 is a prime.

It is not a weakly prime, because it can be changed into another prime (646651450279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323325725289 + 323325725290.

It is an arithmetic number, because the mean of its divisors is an integer number (323325725290).

Almost surely, 2^646651450579 is an apocalyptic number.

646651450579 is a deficient number, since it is larger than the sum of its proper divisors (1).

646651450579 is an equidigital number, since it uses as much as digits as its factorization.

646651450579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216000, while the sum is 58.

The spelling of 646651450579 in words is "six hundred forty-six billion, six hundred fifty-one million, four hundred fifty thousand, five hundred seventy-nine".