643322121223346 has 8 divisors (see below), whose sum is σ = 966408563198700. Its totient is φ = 321185933490448.

The previous prime is 643322121223277. The next prime is 643322121223361.

643322121223346 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 638951450145121 + 4370671078225 = 25277489^2 + 2090615^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 643322121223297 and 643322121223306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237563558921 + ... + 237563561628.

Almost surely, 2^{643322121223346} is an apocalyptic number.

643322121223346 is a deficient number, since it is larger than the sum of its proper divisors (323086441975354).

643322121223346 is a wasteful number, since it uses less digits than its factorization.

643322121223346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475127121228.

The product of its digits is 1492992, while the sum is 44.

The spelling of 643322121223346 in words is "six hundred forty-three trillion, three hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-three thousand, three hundred forty-six".