320063929781 has 2 divisors, whose sum is σ = 320063929782. Its totient is φ = 320063929780.

The previous prime is 320063929769. The next prime is 320063929877. The reversal of 320063929781 is 187929360023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313213719025 + 6850210756 = 559655^2 + 82766^2 .

It is a cyclic number.

It is not a de Polignac number, because 320063929781 - 2³⁴ = 302884060597 is a prime.

It is a super-2 number, since 2×320063929781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320063929481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160031964890 + 160031964891.

It is an arithmetic number, because the mean of its divisors is an integer number (160031964891).

Almost surely, 2^320063929781 is an apocalyptic number.

It is an amenable number.

320063929781 is a deficient number, since it is larger than the sum of its proper divisors (1).

320063929781 is an equidigital number, since it uses as much as digits as its factorization.

320063929781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 320063929781 in words is "three hundred twenty billion, sixty-three million, nine hundred twenty-nine thousand, seven hundred eighty-one".