320655042640 has 40 divisors (see below), whose sum is σ = 746793139680. Its totient is φ = 128043494016.

The previous prime is 320655042637. The next prime is 320655042647. The reversal of 320655042640 is 46240556023.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 320655042640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320655042647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3367170 + ... + 3461089.

It is an arithmetic number, because the mean of its divisors is an integer number (18669828492).

Almost surely, 2^320655042640 is an apocalyptic number.

It is an amenable number.

320655042640 is an abundant number, since it is smaller than the sum of its proper divisors (426138097040).

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

320655042640 is a wasteful number, since it uses less digits than its factorization.

320655042640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828859 (or 6828853 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 320655042640 its reverse (46240556023), we get a palindrome (366895598663).

It can be divided in two parts, 32065 and 5042640, that added together give a palindrome (5074705).

The spelling of 320655042640 in words is "three hundred twenty billion, six hundred fifty-five million, forty-two thousand, six hundred forty".