2778505505481 has 16 divisors (see below), whose sum is σ = 3721985173440. Its totient is φ = 1843694529600.

The previous prime is 2778505505437. The next prime is 2778505505497. The reversal of 2778505505481 is 1845055058772.

It is not a de Polignac number, because 2778505505481 - 2⁹ = 2778505504969 is a prime.

It is a super-2 number, since 2×2778505505481² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2778505501481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 789810 + ... + 2486123.

It is an arithmetic number, because the mean of its divisors is an integer number (232624073340).

Almost surely, 2^{2778505505481} is an apocalyptic number.

It is an amenable number.

2778505505481 is a deficient number, since it is larger than the sum of its proper divisors (943479667959).

2778505505481 is a wasteful number, since it uses less digits than its factorization.

2778505505481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3277256.

The product of its (nonzero) digits is 15680000, while the sum is 57.

The spelling of 2778505505481 in words is "two trillion, seven hundred seventy-eight billion, five hundred five million, five hundred five thousand, four hundred eighty-one".