2778956996985 has 48 divisors (see below), whose sum is σ = 5188069268928. Its totient is φ = 1367921808000.

The previous prime is 2778956996951. The next prime is 2778956996987. The reversal of 2778956996985 is 5896996598772.

2778956996985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2778956996985 - 2¹⁴ = 2778956980601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2778956996895 and 2778956996904.

It is not an unprimeable number, because it can be changed into a prime (2778956996987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4190410 + ... + 4808060.

It is an arithmetic number, because the mean of its divisors is an integer number (108084776436).

Almost surely, 2^{2778956996985} is an apocalyptic number.

It is an amenable number.

2778956996985 is a deficient number, since it is larger than the sum of its proper divisors (2409112271943).

2778956996985 is a wasteful number, since it uses less digits than its factorization.

2778956996985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625366 (or 625363 counting only the distinct ones).

The product of its digits is 37035532800, while the sum is 90.

The spelling of 2778956996985 in words is "two trillion, seven hundred seventy-eight billion, nine hundred fifty-six million, nine hundred ninety-six thousand, nine hundred eighty-five".