2777778888769 has 2 divisors, whose sum is σ = 2777778888770. Its totient is φ = 2777778888768.

The previous prime is 2777778888743. The next prime is 2777778888923. The reversal of 2777778888769 is 9678888777772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2578876268544 + 198902620225 = 1605888^2 + 445985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2777778888769 - 2⁹ = 2777778888257 is a prime.

It is a super-2 number, since 2×2777778888769² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2777778888719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388889444384 + 1388889444385.

It is an arithmetic number, because the mean of its divisors is an integer number (1388889444385).

Almost surely, 2^{2777778888769} is an apocalyptic number.

It is an amenable number.

2777778888769 is a deficient number, since it is larger than the sum of its proper divisors (1).

2777778888769 is an equidigital number, since it uses as much as digits as its factorization.

2777778888769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52044152832, while the sum is 91.

The spelling of 2777778888769 in words is "two trillion, seven hundred seventy-seven billion, seven hundred seventy-eight million, eight hundred eighty-eight thousand, seven hundred sixty-nine".