395399778481 has 2 divisors, whose sum is σ = 395399778482. Its totient is φ = 395399778480.

The previous prime is 395399778467. The next prime is 395399778623. The reversal of 395399778481 is 184877993593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394363904256 + 1035874225 = 627984^2 + 32185^2 .

It is a cyclic number.

It is not a de Polignac number, because 395399778481 - 2³⁵ = 361040040113 is a prime.

It is a super-2 number, since 2×395399778481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (395399778461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197699889240 + 197699889241.

It is an arithmetic number, because the mean of its divisors is an integer number (197699889241).

Almost surely, 2^395399778481 is an apocalyptic number.

It is an amenable number.

395399778481 is a deficient number, since it is larger than the sum of its proper divisors (1).

395399778481 is an equidigital number, since it uses as much as digits as its factorization.

395399778481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 411505920, while the sum is 73.

The spelling of 395399778481 in words is "three hundred ninety-five billion, three hundred ninety-nine million, seven hundred seventy-eight thousand, four hundred eighty-one".