2778543377 has 2 divisors, whose sum is σ = 2778543378. Its totient is φ = 2778543376.

The previous prime is 2778543373. The next prime is 2778543433. The reversal of 2778543377 is 7733458772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1436713216 + 1341830161 = 37904^2 + 36631^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778543377 - 2² = 2778543373 is a prime.

It is a super-4 number, since 4×2778543377⁴ (a number of 39 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (2778543373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389271688 + 1389271689.

It is an arithmetic number, because the mean of its divisors is an integer number (1389271689).

Almost surely, 2^2778543377 is an apocalyptic number.

It is an amenable number.

2778543377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778543377 is an equidigital number, since it uses as much as digits as its factorization.

2778543377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 53.

The square root of 2778543377 is about 52711.8902810362. The cubic root of 2778543377 is about 1405.8502432517.

The spelling of 2778543377 in words is "two billion, seven hundred seventy-eight million, five hundred forty-three thousand, three hundred seventy-seven".