278455680823 has 2 divisors, whose sum is σ = 278455680824. Its totient is φ = 278455680822.

The previous prime is 278455680739. The next prime is 278455680911. The reversal of 278455680823 is 328086554872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278455680823 - 2²¹ = 278453583671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278455680523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139227840411 + 139227840412.

It is an arithmetic number, because the mean of its divisors is an integer number (139227840412).

Almost surely, 2^278455680823 is an apocalyptic number.

278455680823 is a deficient number, since it is larger than the sum of its proper divisors (1).

278455680823 is an equidigital number, since it uses as much as digits as its factorization.

278455680823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25804800, while the sum is 58.

The spelling of 278455680823 in words is "two hundred seventy-eight billion, four hundred fifty-five million, six hundred eighty thousand, eight hundred twenty-three".