278144255393 has 4 divisors (see below), whose sum is σ = 278354812548. Its totient is φ = 277933698240.

The previous prime is 278144255353. The next prime is 278144255423. The reversal of 278144255393 is 393552441872.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101367734689 + 176776520704 = 318383^2 + 420448^2 .

It is a cyclic number.

It is not a de Polignac number, because 278144255393 - 2⁶ = 278144255329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278144255303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105276596 + ... + 105279237.

It is an arithmetic number, because the mean of its divisors is an integer number (69588703137).

Almost surely, 2^278144255393 is an apocalyptic number.

It is an amenable number.

278144255393 is a deficient number, since it is larger than the sum of its proper divisors (210557155).

278144255393 is a wasteful number, since it uses less digits than its factorization.

278144255393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210557154.

The product of its digits is 7257600, while the sum is 53.

The spelling of 278144255393 in words is "two hundred seventy-eight billion, one hundred forty-four million, two hundred fifty-five thousand, three hundred ninety-three".