643442244346 has 32 divisors (see below), whose sum is σ = 1076935668480. Its totient is φ = 285817540800.

The previous prime is 643442244337. The next prime is 643442244359.

643442244346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643442244296 and 643442244305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212760 + ... + 1154188.

It is an arithmetic number, because the mean of its divisors is an integer number (33654239640).

Almost surely, 2^643442244346 is an apocalyptic number.

643442244346 is a deficient number, since it is larger than the sum of its proper divisors (433493424134).

643442244346 is a wasteful number, since it uses less digits than its factorization.

643442244346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942150.

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

It can be divided in two parts, 643442 and 244346, that added together give a palindrome (887788).

The spelling of 643442244346 in words is "six hundred forty-three billion, four hundred forty-two million, two hundred forty-four thousand, three hundred forty-six".