2777778888377 has 2 divisors, whose sum is σ = 2777778888378. Its totient is φ = 2777778888376.

The previous prime is 2777778888373. The next prime is 2777778888403. The reversal of 2777778888377 is 7738888777772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2457670748416 + 320108139961 = 1567696^2 + 565781^2 .

It is a cyclic number.

It is not a de Polignac number, because 2777778888377 - 2² = 2777778888373 is a prime.

It is not a weakly prime, because it can be changed into another prime (2777778888373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388889444188 + 1388889444189.

It is an arithmetic number, because the mean of its divisors is an integer number (1388889444189).

Almost surely, 2^{2777778888377} is an apocalyptic number.

It is an amenable number.

2777778888377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2777778888377 is an equidigital number, since it uses as much as digits as its factorization.

2777778888377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20239392768, while the sum is 86.

The spelling of 2777778888377 in words is "two trillion, seven hundred seventy-seven billion, seven hundred seventy-eight million, eight hundred eighty-eight thousand, three hundred seventy-seven".