643803848308346 has 24 divisors (see below), whose sum is σ = 1061785298994420. Its totient is φ = 292553461601280.

The previous prime is 643803848308343. The next prime is 643803848308351.

643803848308346 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 573545739904225 + 70258108404121 = 23948815^2 + 8382011^2 .

It is not an unprimeable number, because it can be changed into a prime (643803848308343) 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, 383940161 + ... + 385613348.

Almost surely, 2^{643803848308346} is an apocalyptic number.

643803848308346 is a deficient number, since it is larger than the sum of its proper divisors (417981450686074).

643803848308346 is a wasteful number, since it uses less digits than its factorization.

643803848308346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769556990 (or 769556979 counting only the distinct ones).

The product of its (nonzero) digits is 764411904, while the sum is 68.

The spelling of 643803848308346 in words is "six hundred forty-three trillion, eight hundred three billion, eight hundred forty-eight million, three hundred eight thousand, three hundred forty-six".