278626054961 has 2 divisors, whose sum is σ = 278626054962. Its totient is φ = 278626054960.

The previous prime is 278626054921. The next prime is 278626055021. The reversal of 278626054961 is 169450626872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268692942736 + 9933112225 = 518356^2 + 99665^2 .

It is a cyclic number.

It is not a de Polignac number, because 278626054961 - 2⁶ = 278626054897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278626054897 and 278626054906.

It is not a weakly prime, because it can be changed into another prime (278626054901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139313027480 + 139313027481.

It is an arithmetic number, because the mean of its divisors is an integer number (139313027481).

Almost surely, 2^278626054961 is an apocalyptic number.

It is an amenable number.

278626054961 is a deficient number, since it is larger than the sum of its proper divisors (1).

278626054961 is an equidigital number, since it uses as much as digits as its factorization.

278626054961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 278626054961 in words is "two hundred seventy-eight billion, six hundred twenty-six million, fifty-four thousand, nine hundred sixty-one".