278884489027225 has 9 divisors (see below), whose sum is σ = 345816869932767. Its totient is φ = 223107524422440.

The previous prime is 278884489027201. The next prime is 278884489027247. The reversal of 278884489027225 is 522720984488872.

The square root of 278884489027225 is 16699835.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 100398416049801 + 178486072977424 = 10019901^2 + 13359868^2 .

It is not a de Polignac number, because 278884489027225 - 2⁷ = 278884489027097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 81829192 + ... + 85169158.

Almost surely, 2^{278884489027225} is an apocalyptic number.

278884489027225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

278884489027225 is the 16699835-th square number.

278884489027225 is the 8349918-th centered octagonal number.

It is an amenable number.

278884489027225 is a deficient number, since it is larger than the sum of its proper divisors (66932380905542).

278884489027225 is an frugal number, since it uses more digits than its factorization.

278884489027225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6679944 (or 3339972 counting only the distinct ones).

The product of its (nonzero) digits is 2312110080, while the sum is 76.

The spelling of 278884489027225 in words is "two hundred seventy-eight trillion, eight hundred eighty-four billion, four hundred eighty-nine million, twenty-seven thousand, two hundred twenty-five".