643442202244346 has 8 divisors (see below), whose sum is σ = 965204689453524. Its totient is φ = 321707305759840.

The previous prime is 643442202244343. The next prime is 643442202244379.

643442202244346 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 574860036585121 + 68582165659225 = 23976239^2 + 8281435^2 .

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 = 643442202244294 and 643442202244303.

It is not an unprimeable number, because it can be changed into a prime (643442202244343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6897622865 + ... + 6897716148.

Almost surely, 2^{643442202244346} is an apocalyptic number.

643442202244346 is a deficient number, since it is larger than the sum of its proper divisors (321762487209178).

643442202244346 is a wasteful number, since it uses less digits than its factorization.

643442202244346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13795362336.

The product of its (nonzero) digits is 21233664, while the sum is 50.

It can be divided in two parts, 64344220 and 2244346, that added together give a palindrome (66588566).

The spelling of 643442202244346 in words is "six hundred forty-three trillion, four hundred forty-two billion, two hundred two million, two hundred forty-four thousand, three hundred forty-six".