643346334244450 has 24 divisors (see below), whose sum is σ = 1196646663104640. Its totient is φ = 257333698986000.

The previous prime is 643346334244441. The next prime is 643346334244451. The reversal of 643346334244450 is 54442433643346.

It is a super-3 number, since 3×643346334244450³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643346334244391 and 643346334244400.

It is not an unprimeable number, because it can be changed into a prime (643346334244451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118179226 + ... + 123503125.

It is an arithmetic number, because the mean of its divisors is an integer number (49860277629360).

Almost surely, 2^{643346334244450} is an apocalyptic number.

643346334244450 is a deficient number, since it is larger than the sum of its proper divisors (553300328860190).

643346334244450 is a wasteful number, since it uses less digits than its factorization.

643346334244450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241735602 (or 241735597 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 55.

Adding to 643346334244450 its reverse (54442433643346), we get a palindrome (697788767887796).

The spelling of 643346334244450 in words is "six hundred forty-three trillion, three hundred forty-six billion, three hundred thirty-four million, two hundred forty-four thousand, four hundred fifty".