643405510244 has 96 divisors (see below), whose sum is σ = 1312950804480. Its totient is φ = 270208224000.

The previous prime is 643405510207. The next prime is 643405510331. The reversal of 643405510244 is 442015504346.

It is a super-2 number, since 2×643405510244² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643405510198 and 643405510207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183252449 + ... + 183255959.

It is an arithmetic number, because the mean of its divisors is an integer number (13676570880).

Almost surely, 2^643405510244 is an apocalyptic number.

It is an amenable number.

643405510244 is an abundant number, since it is smaller than the sum of its proper divisors (669545294236).

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

643405510244 is a wasteful number, since it uses less digits than its factorization.

643405510244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249 (or 4247 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 643405510244 in words is "six hundred forty-three billion, four hundred five million, five hundred ten thousand, two hundred forty-four".