278795087899 has 2 divisors, whose sum is σ = 278795087900. Its totient is φ = 278795087898.

The previous prime is 278795087849. The next prime is 278795087917. The reversal of 278795087899 is 998780597872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278795087899 - 2¹¹ = 278795085851 is a prime.

It is a super-2 number, since 2×278795087899² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278795087819) 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, 139397543949 + 139397543950.

It is an arithmetic number, because the mean of its divisors is an integer number (139397543950).

Almost surely, 2^278795087899 is an apocalyptic number.

278795087899 is a deficient number, since it is larger than the sum of its proper divisors (1).

278795087899 is an equidigital number, since it uses as much as digits as its factorization.

278795087899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280240640, while the sum is 79.

The spelling of 278795087899 in words is "two hundred seventy-eight billion, seven hundred ninety-five million, eighty-seven thousand, eight hundred ninety-nine".