2778668899042 has 4 divisors (see below), whose sum is σ = 4168003348566. Its totient is φ = 1389334449520.

The previous prime is 2778668898959. The next prime is 2778668899043. The reversal of 2778668899042 is 2409988668772.

2778668899042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2478889653601 + 299779245441 = 1574449^2 + 547521^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2778668899042.

It is not an unprimeable number, because it can be changed into a prime (2778668899043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694667224759 + ... + 694667224762.

Almost surely, 2^{2778668899042} is an apocalyptic number.

2778668899042 is a deficient number, since it is larger than the sum of its proper divisors (1389334449524).

2778668899042 is a wasteful number, since it uses less digits than its factorization.

2778668899042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389334449523.

The product of its (nonzero) digits is 1170505728, while the sum is 76.

The spelling of 2778668899042 in words is "two trillion, seven hundred seventy-eight billion, six hundred sixty-eight million, eight hundred ninety-nine thousand, forty-two".