278225290881 has 16 divisors (see below), whose sum is σ = 412451776000. Its totient is φ = 185363755344.

The previous prime is 278225290831. The next prime is 278225290901. The reversal of 278225290881 is 188092522872.

278225290881 is a `hidden beast` number, since 278 + 2 + 2 + 5 + 290 + 8 + 81 = 666.

It is not a de Polignac number, because 278225290881 - 2⁷ = 278225290753 is a prime.

It is a super-2 number, since 2×278225290881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (278225290831) 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 15 ways as a sum of consecutive naturals, for example, 3284401 + ... + 3368046.

It is an arithmetic number, because the mean of its divisors is an integer number (25778236000).

Almost surely, 2^278225290881 is an apocalyptic number.

It is an amenable number.

278225290881 is a deficient number, since it is larger than the sum of its proper divisors (134226485119).

278225290881 is a wasteful number, since it uses less digits than its factorization.

278225290881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654005 (or 6653999 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 278225290881 in words is "two hundred seventy-eight billion, two hundred twenty-five million, two hundred ninety thousand, eight hundred eighty-one".