2778371801 has 2 divisors, whose sum is σ = 2778371802. Its totient is φ = 2778371800.

The previous prime is 2778371753. The next prime is 2778371803. The reversal of 2778371801 is 1081738772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2761397401 + 16974400 = 52549^2 + 4120^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778371801 - 2¹⁴ = 2778355417 is a prime.

It is a Sophie Germain prime.

Together with 2778371803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2778371803) 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, 1389185900 + 1389185901.

It is an arithmetic number, because the mean of its divisors is an integer number (1389185901).

Almost surely, 2^2778371801 is an apocalyptic number.

It is an amenable number.

2778371801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778371801 is an equidigital number, since it uses as much as digits as its factorization.

2778371801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131712, while the sum is 44.

The square root of 2778371801 is about 52710.2627673207. The cubic root of 2778371801 is about 1405.8213054122.

The spelling of 2778371801 in words is "two billion, seven hundred seventy-eight million, three hundred seventy-one thousand, eight hundred one".