643244442346 has 8 divisors (see below), whose sum is σ = 1052581814784. Its totient is φ = 292383837420.

The previous prime is 643244442329. The next prime is 643244442349.

643244442346 is nontrivially palindromic in base 10.

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 = 643244442296 and 643244442305.

It is not an unprimeable number, because it can be changed into a prime (643244442349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14619191850 + ... + 14619191893.

It is an arithmetic number, because the mean of its divisors is an integer number (131572726848).

Almost surely, 2^643244442346 is an apocalyptic number.

643244442346 is a deficient number, since it is larger than the sum of its proper divisors (409337372438).

643244442346 is a wasteful number, since it uses less digits than its factorization.

643244442346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29238383756.

The product of its digits is 5308416, while the sum is 46.

The spelling of 643244442346 in words is "six hundred forty-three billion, two hundred forty-four million, four hundred forty-two thousand, three hundred forty-six".