640443344046 has 16 divisors (see below), whose sum is σ = 1397330932608. Its totient is φ = 194073740600.

The previous prime is 640443344033. The next prime is 640443344131.

640443344046 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 640443343989 and 640443344007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4851843450 + ... + 4851843581.

It is an arithmetic number, because the mean of its divisors is an integer number (87333183288).

Almost surely, 2^640443344046 is an apocalyptic number.

640443344046 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

640443344046 is an abundant number, since it is smaller than the sum of its proper divisors (756887588562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640443344046 is a wasteful number, since it uses less digits than its factorization.

640443344046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9703687047.

The product of its (nonzero) digits is 1327104, while the sum is 42.

It can be divided in two parts, 640443 and 344046, that added together give a palindrome (984489).

The spelling of 640443344046 in words is "six hundred forty billion, four hundred forty-three million, three hundred forty-four thousand, forty-six".