320551042517 has 2 divisors, whose sum is σ = 320551042518. Its totient is φ = 320551042516.

The previous prime is 320551042459. The next prime is 320551042549. The reversal of 320551042517 is 715240155023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177686697841 + 142864344676 = 421529^2 + 377974^2 .

It is a cyclic number.

It is not a de Polignac number, because 320551042517 - 2⁸ = 320551042261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320551042597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160275521258 + 160275521259.

It is an arithmetic number, because the mean of its divisors is an integer number (160275521259).

Almost surely, 2^320551042517 is an apocalyptic number.

It is an amenable number.

320551042517 is a deficient number, since it is larger than the sum of its proper divisors (1).

320551042517 is an equidigital number, since it uses as much as digits as its factorization.

320551042517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 320551042517 in words is "three hundred twenty billion, five hundred fifty-one million, forty-two thousand, five hundred seventeen".