646753943552 has 36 divisors (see below), whose sum is σ = 1293503214906. Its totient is φ = 323376906240.

The previous prime is 646753943531. The next prime is 646753943597. The reversal of 646753943552 is 255349357646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 555346886656 + 91407056896 = 745216^2 + 302336^2 .

It is a junction number, because it is equal to n+sod(n) for n = 646753943491 and 646753943500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2336099 + ... + 2598242.

Almost surely, 2^646753943552 is an apocalyptic number.

It is an amenable number.

646753943552 is a deficient number, since it is larger than the sum of its proper divisors (646749271354).

646753943552 is an frugal number, since it uses more digits than its factorization.

646753943552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934375 (or 4934343 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 59.

The spelling of 646753943552 in words is "six hundred forty-six billion, seven hundred fifty-three million, nine hundred forty-three thousand, five hundred fifty-two".