278686852104181 has 2 divisors, whose sum is σ = 278686852104182. Its totient is φ = 278686852104180.

The previous prime is 278686852104179. The next prime is 278686852104257. The reversal of 278686852104181 is 181401258686872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148762759623556 + 129924092480625 = 12196834^2 + 11398425^2 .

It is a cyclic number.

It is not a de Polignac number, because 278686852104181 - 2¹ = 278686852104179 is a prime.

It is a super-2 number, since 2×278686852104181² (a number of 30 digits) contains 22 as substring.

Together with 278686852104179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278686852104281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139343426052090 + 139343426052091.

It is an arithmetic number, because the mean of its divisors is an integer number (139343426052091).

Almost surely, 2^{278686852104181} is an apocalyptic number.

It is an amenable number.

278686852104181 is a deficient number, since it is larger than the sum of its proper divisors (1).

278686852104181 is an equidigital number, since it uses as much as digits as its factorization.

278686852104181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82575360, while the sum is 67.

The spelling of 278686852104181 in words is "two hundred seventy-eight trillion, six hundred eighty-six billion, eight hundred fifty-two million, one hundred four thousand, one hundred eighty-one".