2777778883889 has 2 divisors, whose sum is σ = 2777778883890. Its totient is φ = 2777778883888.

The previous prime is 2777778883883. The next prime is 2777778883931. The reversal of 2777778883889 is 9883888777772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2389550197489 + 388228686400 = 1545817^2 + 623080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2777778883889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2777778883883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388889441944 + 1388889441945.

It is an arithmetic number, because the mean of its divisors is an integer number (1388889441945).

Almost surely, 2^{2777778883889} is an apocalyptic number.

It is an amenable number.

2777778883889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2777778883889 is an equidigital number, since it uses as much as digits as its factorization.

2777778883889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29739515904, while the sum is 89.

The spelling of 2777778883889 in words is "two trillion, seven hundred seventy-seven billion, seven hundred seventy-eight million, eight hundred eighty-three thousand, eight hundred eighty-nine".