320445650381 has 2 divisors, whose sum is σ = 320445650382. Its totient is φ = 320445650380.

The previous prime is 320445650359. The next prime is 320445650383. The reversal of 320445650381 is 183056544023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286723837156 + 33721813225 = 535466^2 + 183635^2 .

It is a cyclic number.

It is not a de Polignac number, because 320445650381 - 2¹⁰ = 320445649357 is a prime.

It is a super-2 number, since 2×320445650381² (a number of 24 digits) contains 22 as substring.

Together with 320445650383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320445650383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160222825190 + 160222825191.

It is an arithmetic number, because the mean of its divisors is an integer number (160222825191).

Almost surely, 2^320445650381 is an apocalyptic number.

It is an amenable number.

320445650381 is a deficient number, since it is larger than the sum of its proper divisors (1).

320445650381 is an equidigital number, since it uses as much as digits as its factorization.

320445650381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 320445650381 in words is "three hundred twenty billion, four hundred forty-five million, six hundred fifty thousand, three hundred eighty-one".