278525510855 has 4 divisors (see below), whose sum is σ = 334230613032. Its totient is φ = 222820408680.

The previous prime is 278525510831. The next prime is 278525510867. The reversal of 278525510855 is 558015525872.

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

It is not a de Polignac number, because 278525510855 - 2¹⁰ = 278525509831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278525510797 and 278525510806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27852551081 + ... + 27852551090.

It is an arithmetic number, because the mean of its divisors is an integer number (83557653258).

Almost surely, 2^278525510855 is an apocalyptic number.

278525510855 is a deficient number, since it is larger than the sum of its proper divisors (55705102177).

278525510855 is an equidigital number, since it uses as much as digits as its factorization.

278525510855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55705102176.

The product of its (nonzero) digits is 5600000, while the sum is 53.

The spelling of 278525510855 in words is "two hundred seventy-eight billion, five hundred twenty-five million, five hundred ten thousand, eight hundred fifty-five".