643434202434346 has 4 divisors (see below), whose sum is σ = 965151303651522. Its totient is φ = 321717101217172.

The previous prime is 643434202434313. The next prime is 643434202434377.

643434202434346 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 363909609252225 + 279524593182121 = 19076415^2 + 16718989^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643434202434293 and 643434202434302.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160858550608585 + ... + 160858550608588.

Almost surely, 2^{643434202434346} is an apocalyptic number.

643434202434346 is a deficient number, since it is larger than the sum of its proper divisors (321717101217176).

643434202434346 is a wasteful number, since it uses less digits than its factorization.

643434202434346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321717101217175.

The product of its (nonzero) digits is 47775744, while the sum is 52.

It can be divided in two parts, 64343420 and 2434346, that added together give a palindrome (66777766).

The spelling of 643434202434346 in words is "six hundred forty-three trillion, four hundred thirty-four billion, two hundred two million, four hundred thirty-four thousand, three hundred forty-six".