320556434226643 has 4 divisors (see below), whose sum is σ = 322523038117768. Its totient is φ = 318589830335520.

The previous prime is 320556434226641. The next prime is 320556434226689. The reversal of 320556434226643 is 346622434655023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320556434226643 - 2¹ = 320556434226641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320556434226641) 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, 983301945318 + ... + 983301945643.

It is an arithmetic number, because the mean of its divisors is an integer number (80630759529442).

Almost surely, 2^{320556434226643} is an apocalyptic number.

320556434226643 is a deficient number, since it is larger than the sum of its proper divisors (1966603891125).

320556434226643 is a wasteful number, since it uses less digits than its factorization.

320556434226643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966603891124.

The product of its (nonzero) digits is 74649600, while the sum is 55.

The spelling of 320556434226643 in words is "three hundred twenty trillion, five hundred fifty-six billion, four hundred thirty-four million, two hundred twenty-six thousand, six hundred forty-three".