278349777255 has 16 divisors (see below), whose sum is σ = 485846884224. Its totient is φ = 134957467680.

The previous prime is 278349777247. The next prime is 278349777259. The reversal of 278349777255 is 552777943872.

It is not a de Polignac number, because 278349777255 - 2³ = 278349777247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278349777259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843484009 + ... + 843484338.

It is an arithmetic number, because the mean of its divisors is an integer number (30365430264).

Almost surely, 2^278349777255 is an apocalyptic number.

278349777255 is a deficient number, since it is larger than the sum of its proper divisors (207497106969).

278349777255 is a wasteful number, since it uses less digits than its factorization.

278349777255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686968366.

The product of its digits is 207446400, while the sum is 66.

It can be divided in two parts, 27834 and 9777255, that added together give a palindrome (9805089).

The spelling of 278349777255 in words is "two hundred seventy-eight billion, three hundred forty-nine million, seven hundred seventy-seven thousand, two hundred fifty-five".