278721609079 has 2 divisors, whose sum is σ = 278721609080. Its totient is φ = 278721609078.

The previous prime is 278721609077. The next prime is 278721609137. The reversal of 278721609079 is 970906127872.

It is an a-pointer prime, because the next prime (278721609137) can be obtained adding 278721609079 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278721609079 - 2¹ = 278721609077 is a prime.

Together with 278721609077, 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 (278721609077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139360804539 + 139360804540.

It is an arithmetic number, because the mean of its divisors is an integer number (139360804540).

Almost surely, 2^278721609079 is an apocalyptic number.

278721609079 is a deficient number, since it is larger than the sum of its proper divisors (1).

278721609079 is an equidigital number, since it uses as much as digits as its factorization.

278721609079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The spelling of 278721609079 in words is "two hundred seventy-eight billion, seven hundred twenty-one million, six hundred nine thousand, seventy-nine".