2778888999999 has 32 divisors (see below), whose sum is σ = 4269227008000. Its totient is φ = 1574953038432.

The previous prime is 2778888999949. The next prime is 2778889000007. The reversal of 2778888999999 is 9999998888772.

It is a Cunningham number, because it is equal to 1667000²-1.

It is not a de Polignac number, because 2778888999999 - 2²⁹ = 2778352129087 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778888999949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 833502 + ... + 2500500.

It is an arithmetic number, because the mean of its divisors is an integer number (133413344000).

Almost surely, 2^{2778888999999} is an apocalyptic number.

2778888999999 is a deficient number, since it is larger than the sum of its proper divisors (1490338008001).

2778888999999 is a wasteful number, since it uses less digits than its factorization.

2778888999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667659.

The product of its digits is 213324668928, while the sum is 102.

The spelling of 2778888999999 in words is "two trillion, seven hundred seventy-eight billion, eight hundred eighty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".