646880795522 has 16 divisors (see below), whose sum is σ = 1045358266680. Its totient is φ = 298446943872.

The previous prime is 646880795497. The next prime is 646880795527. The reversal of 646880795522 is 225597088646.

It is a happy number.

It is a Cunningham number, because it is equal to 804289²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 105833753041 + 541047042481 = 325321^2 + 735559^2 .

It is not an unprimeable number, because it can be changed into a prime (646880795527) 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 in 7 ways as a sum of consecutive naturals, for example, 4656197 + ... + 4793112.

Almost surely, 2^646880795522 is an apocalyptic number.

646880795522 is a deficient number, since it is larger than the sum of its proper divisors (398477471158).

646880795522 is a wasteful number, since it uses less digits than its factorization.

646880795522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9451957.

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 646880795522 in words is "six hundred forty-six billion, eight hundred eighty million, seven hundred ninety-five thousand, five hundred twenty-two".