278055055081 has 2 divisors, whose sum is σ = 278055055082. Its totient is φ = 278055055080.

The previous prime is 278055055073. The next prime is 278055055123. The reversal of 278055055081 is 180550550872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254197472400 + 23857582681 = 504180^2 + 154459^2 .

It is a cyclic number.

It is not a de Polignac number, because 278055055081 - 2³ = 278055055073 is a prime.

It is a super-2 number, since 2×278055055081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278055059081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139027527540 + 139027527541.

It is an arithmetic number, because the mean of its divisors is an integer number (139027527541).

Almost surely, 2^278055055081 is an apocalyptic number.

It is an amenable number.

278055055081 is a deficient number, since it is larger than the sum of its proper divisors (1).

278055055081 is an equidigital number, since it uses as much as digits as its factorization.

278055055081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560000, while the sum is 46.

The spelling of 278055055081 in words is "two hundred seventy-eight billion, fifty-five million, fifty-five thousand, eighty-one".