646346406536533 has 2 divisors, whose sum is σ = 646346406536534. Its totient is φ = 646346406536532.

The previous prime is 646346406536507. The next prime is 646346406536587. The reversal of 646346406536533 is 335635604643646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370728569101969 + 275617837434564 = 19254313^2 + 16601742^2 .

It is a cyclic number.

It is not a de Polignac number, because 646346406536533 - 2¹⁷ = 646346406405461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646346406536333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323173203268266 + 323173203268267.

It is an arithmetic number, because the mean of its divisors is an integer number (323173203268267).

Almost surely, 2^{646346406536533} is an apocalyptic number.

It is an amenable number.

646346406536533 is a deficient number, since it is larger than the sum of its proper divisors (1).

646346406536533 is an equidigital number, since it uses as much as digits as its factorization.

646346406536533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1007769600, while the sum is 64.

The spelling of 646346406536533 in words is "six hundred forty-six trillion, three hundred forty-six billion, four hundred six million, five hundred thirty-six thousand, five hundred thirty-three".