2778540659 has 2 divisors, whose sum is σ = 2778540660. Its totient is φ = 2778540658.

The previous prime is 2778540643. The next prime is 2778540697. The reversal of 2778540659 is 9560458772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778540659 - 2⁴ = 2778540643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2778540659.

It is not a weakly prime, because it can be changed into another prime (2778540959) 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, 1389270329 + 1389270330.

It is an arithmetic number, because the mean of its divisors is an integer number (1389270330).

Almost surely, 2^2778540659 is an apocalyptic number.

2778540659 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778540659 is an equidigital number, since it uses as much as digits as its factorization.

2778540659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The square root of 2778540659 is about 52711.8644993705. The cubic root of 2778540659 is about 1405.8497848457.

The spelling of 2778540659 in words is "two billion, seven hundred seventy-eight million, five hundred forty thousand, six hundred fifty-nine".