646346406536522 has 32 divisors (see below), whose sum is σ = 985506774492240. Its totient is φ = 317868826176000.

The previous prime is 646346406536507. The next prime is 646346406536533. The reversal of 646346406536522 is 225635604643646.

It can be written as a sum of positive squares in 8 ways, for example, as 616743002844721 + 29603403691801 = 24834311^2 + 5440901^2 .

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 311389388 + ... + 313458200.

Almost surely, 2^{646346406536522} is an apocalyptic number.

646346406536522 is a deficient number, since it is larger than the sum of its proper divisors (339160367955718).

646346406536522 is a wasteful number, since it uses less digits than its factorization.

646346406536522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074778.

The product of its (nonzero) digits is 447897600, while the sum is 62.

The spelling of 646346406536522 in words is "six hundred forty-six trillion, three hundred forty-six billion, four hundred six million, five hundred thirty-six thousand, five hundred twenty-two".