320643507705 has 16 divisors (see below), whose sum is σ = 514100666880. Its totient is φ = 170652852608.

The previous prime is 320643507703. The next prime is 320643507731. The reversal of 320643507705 is 507705346023.

It is a cyclic number.

It is not a de Polignac number, because 320643507705 - 2¹ = 320643507703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320643507703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22306212 + ... + 22320581.

It is an arithmetic number, because the mean of its divisors is an integer number (32131291680).

Almost surely, 2^320643507705 is an apocalyptic number.

It is an amenable number.

320643507705 is a deficient number, since it is larger than the sum of its proper divisors (193457159175).

320643507705 is a wasteful number, since it uses less digits than its factorization.

320643507705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44627280.

The product of its (nonzero) digits is 529200, while the sum is 42.

The spelling of 320643507705 in words is "three hundred twenty billion, six hundred forty-three million, five hundred seven thousand, seven hundred five".