2222222777778 has 8 divisors (see below), whose sum is σ = 4444445555568. Its totient is φ = 740740925924.

The previous prime is 2222222777717. The next prime is 2222222777807. The reversal of 2222222777778 is 8777772222222.

It is a sphenic number, since it is the product of 3 distinct primes.

2222222777778 is an admirable number.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185185231476 + ... + 185185231487.

It is an arithmetic number, because the mean of its divisors is an integer number (555555694446).

Almost surely, 2^{2222222777778} is an apocalyptic number.

2222222777778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2222222777778 is a wasteful number, since it uses less digits than its factorization.

2222222777778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370370462968.

The product of its digits is 17210368, while the sum is 57.

It can be divided in two parts, 222222 and 2777778, that multiplied together give a palindrome (617283382716).

The spelling of 2222222777778 in words is "two trillion, two hundred twenty-two billion, two hundred twenty-two million, seven hundred seventy-seven thousand, seven hundred seventy-eight".