318408505777 has 2 divisors, whose sum is σ = 318408505778. Its totient is φ = 318408505776.

The previous prime is 318408505757. The next prime is 318408505781. The reversal of 318408505777 is 777505804813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199772347681 + 118636158096 = 446959^2 + 344436^2 .

It is an emirp because it is prime and its reverse (777505804813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318408505777 - 2²⁷ = 318274288049 is a prime.

It is a super-2 number, since 2×318408505777² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (318408505757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159204252888 + 159204252889.

It is an arithmetic number, because the mean of its divisors is an integer number (159204252889).

Almost surely, 2^318408505777 is an apocalyptic number.

It is an amenable number.

318408505777 is a deficient number, since it is larger than the sum of its proper divisors (1).

318408505777 is an equidigital number, since it uses as much as digits as its factorization.

318408505777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 318408505777 in words is "three hundred eighteen billion, four hundred eight million, five hundred five thousand, seven hundred seventy-seven".