2778353749 has 2 divisors, whose sum is σ = 2778353750. Its totient is φ = 2778353748.

The previous prime is 2778353737. The next prime is 2778353779. The reversal of 2778353749 is 9473538772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2739789649 + 38564100 = 52343^2 + 6210^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778353749 - 2¹⁷ = 2778222677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2778353749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778353779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389176874 + 1389176875.

It is an arithmetic number, because the mean of its divisors is an integer number (1389176875).

Almost surely, 2^2778353749 is an apocalyptic number.

It is an amenable number.

2778353749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778353749 is an equidigital number, since it uses as much as digits as its factorization.

2778353749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 55.

The square root of 2778353749 is about 52710.0915290421. The cubic root of 2778353749 is about 1405.8182607104.

The spelling of 2778353749 in words is "two billion, seven hundred seventy-eight million, three hundred fifty-three thousand, seven hundred forty-nine".