2777778888889 has 9 divisors (see below), whose sum is σ = 2838218087631. Its totient is φ = 2718600543720.

The previous prime is 2777778888769. The next prime is 2777778888923. The reversal of 2777778888889 is 9888888777772.

The square root of 2777778888889 is 1666667.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1102359304489 + 1675419584400 = 1049933^2 + 1294380^2 .

It is not a de Polignac number, because 2777778888889 - 2⁹ = 2777778888377 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 2777778888797 and 2777778888806.

It is not an unprimeable number, because it can be changed into a prime (2777778883889) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 78315619 + ... + 78351079.

Almost surely, 2^{2777778888889} is an apocalyptic number.

2777778888889 is the 1666667-th square number.

2777778888889 is the 833334-th centered octagonal number.

It is an amenable number.

2777778888889 is a deficient number, since it is larger than the sum of its proper divisors (60439198742).

2777778888889 is an frugal number, since it uses more digits than its factorization.

2777778888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71016 (or 35508 counting only the distinct ones).

The product of its digits is 79305375744, while the sum is 94.

The spelling of 2777778888889 in words is "two trillion, seven hundred seventy-seven billion, seven hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".