278380644813 has 12 divisors (see below), whose sum is σ = 402199800028. Its totient is φ = 185543516160.

The previous prime is 278380644803. The next prime is 278380644827. The reversal of 278380644813 is 318446083872.

278380644813 is a `hidden beast` number, since 2 + 7 + 83 + 80 + 6 + 4 + 481 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 160097614884 + 118283029929 = 400122^2 + 343923^2 .

It is not a de Polignac number, because 278380644813 - 2⁴ = 278380644797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 278380644813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278380644803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3591220 + ... + 3667917.

Almost surely, 2^278380644813 is an apocalyptic number.

It is an amenable number.

278380644813 is a deficient number, since it is larger than the sum of its proper divisors (123819155215).

278380644813 is a wasteful number, since it uses less digits than its factorization.

278380644813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7263404 (or 7263401 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 278380644813 in words is "two hundred seventy-eight billion, three hundred eighty million, six hundred forty-four thousand, eight hundred thirteen".