320005555577 has 2 divisors, whose sum is σ = 320005555578. Its totient is φ = 320005555576.

The previous prime is 320005555487. The next prime is 320005555579. The reversal of 320005555577 is 775555500023.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190609954921 + 129395600656 = 436589^2 + 359716^2 .

It is a cyclic number.

It is not a de Polignac number, because 320005555577 - 2¹⁴ = 320005539193 is a prime.

Together with 320005555579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320005555579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160002777788 + 160002777789.

It is an arithmetic number, because the mean of its divisors is an integer number (160002777789).

Almost surely, 2^320005555577 is an apocalyptic number.

It is an amenable number.

320005555577 is a deficient number, since it is larger than the sum of its proper divisors (1).

320005555577 is an equidigital number, since it uses as much as digits as its factorization.

320005555577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918750, while the sum is 44.

The spelling of 320005555577 in words is "three hundred twenty billion, five million, five hundred fifty-five thousand, five hundred seventy-seven".