646343056133 has 2 divisors, whose sum is σ = 646343056134. Its totient is φ = 646343056132.

The previous prime is 646343056061. The next prime is 646343056169. The reversal of 646343056133 is 331650343646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579787827844 + 66555228289 = 761438^2 + 257983^2 .

It is a cyclic number.

It is not a de Polignac number, because 646343056133 - 2¹⁰ = 646343055109 is a prime.

It is a super-2 number, since 2×646343056133² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646343056033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323171528066 + 323171528067.

It is an arithmetic number, because the mean of its divisors is an integer number (323171528067).

Almost surely, 2^646343056133 is an apocalyptic number.

It is an amenable number.

646343056133 is a deficient number, since it is larger than the sum of its proper divisors (1).

646343056133 is an equidigital number, since it uses as much as digits as its factorization.

646343056133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 44.

Adding to 646343056133 its reverse (331650343646), we get a palindrome (977993399779).

The spelling of 646343056133 in words is "six hundred forty-six billion, three hundred forty-three million, fifty-six thousand, one hundred thirty-three".