643318956288 has 54 divisors (see below), whose sum is σ = 1854847153614. Its totient is φ = 214439651328.

The previous prime is 643318956281. The next prime is 643318956331. The reversal of 643318956288 is 882659813346.

It is a happy number.

643318956288 is a `hidden beast` number, since 64 + 3 + 3 + 1 + 8 + 9 + 562 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 397747171584 + 245571784704 = 630672^2 + 495552^2 .

It is not an unprimeable number, because it can be changed into a prime (643318956281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139606845 + ... + 139611452.

Almost surely, 2^643318956288 is an apocalyptic number.

It is an amenable number.

643318956288 is an abundant number, since it is smaller than the sum of its proper divisors (1211528197326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643318956288 is a wasteful number, since it uses less digits than its factorization.

643318956288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279218319 (or 279218302 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 643318956288 in words is "six hundred forty-three billion, three hundred eighteen million, nine hundred fifty-six thousand, two hundred eighty-eight".