2778981856019 has 4 divisors (see below), whose sum is σ = 2817050100696. Its totient is φ = 2740913611344.

The previous prime is 2778981856003. The next prime is 2778981856043. The reversal of 2778981856019 is 9106581898772.

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

It is a cyclic number.

It is not a de Polignac number, because 2778981856019 - 2⁴ = 2778981856003 is a prime.

It is a super-2 number, since 2×2778981856019² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778981850019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19034122229 + ... + 19034122374.

It is an arithmetic number, because the mean of its divisors is an integer number (704262525174).

Almost surely, 2^{2778981856019} is an apocalyptic number.

2778981856019 is a deficient number, since it is larger than the sum of its proper divisors (38068244677).

2778981856019 is an equidigital number, since it uses as much as digits as its factorization.

2778981856019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38068244676.

The product of its (nonzero) digits is 121927680, while the sum is 71.

The spelling of 2778981856019 in words is "two trillion, seven hundred seventy-eight billion, nine hundred eighty-one million, eight hundred fifty-six thousand, nineteen".