643310012050 has 24 divisors (see below), whose sum is σ = 1197493747236. Its totient is φ = 257122472640.

The previous prime is 643310011973. The next prime is 643310012069. The reversal of 643310012050 is 50210013346.

It can be written as a sum of positive squares in 6 ways, for example, as 396208561401 + 247101450649 = 629451^2 + 497093^2 .

It is a super-2 number, since 2×643310012050² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4973817 + ... + 5101516.

Almost surely, 2^643310012050 is an apocalyptic number.

643310012050 is a deficient number, since it is larger than the sum of its proper divisors (554183735186).

643310012050 is a wasteful number, since it uses less digits than its factorization.

643310012050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10076622 (or 10076617 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 643310012050 its reverse (50210013346), we get a palindrome (693520025396).

The spelling of 643310012050 in words is "six hundred forty-three billion, three hundred ten million, twelve thousand, fifty".