277394318643161 has 6 divisors (see below), whose sum is σ = 292762424939562. Its totient is φ = 262794617661600.

The previous prime is 277394318643157. The next prime is 277394318643191. The reversal of 277394318643161 is 161346813493772.

It can be written as a sum of positive squares in only one way, i.e., 240949372231936 + 36444946411225 = 15522544^2 + 6036965^2 .

It is not a de Polignac number, because 277394318643161 - 2² = 277394318643157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (277394318643191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 384202657040 + ... + 384202657761.

It is an arithmetic number, because the mean of its divisors is an integer number (48793737489927).

Almost surely, 2^{277394318643161} is an apocalyptic number.

It is an amenable number.

277394318643161 is a deficient number, since it is larger than the sum of its proper divisors (15368106296401).

277394318643161 is an equidigital number, since it uses as much as digits as its factorization.

277394318643161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768405314839 (or 768405314820 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 65.

The spelling of 277394318643161 in words is "two hundred seventy-seven trillion, three hundred ninety-four billion, three hundred eighteen million, six hundred forty-three thousand, one hundred sixty-one".