278552608987 has 2 divisors, whose sum is σ = 278552608988. Its totient is φ = 278552608986.

The previous prime is 278552608981. The next prime is 278552609011. The reversal of 278552608987 is 789806255872.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278552608987 is a prime.

It is not a weakly prime, because it can be changed into another prime (278552608981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139276304493 + 139276304494.

It is an arithmetic number, because the mean of its divisors is an integer number (139276304494).

Almost surely, 2^278552608987 is an apocalyptic number.

278552608987 is a deficient number, since it is larger than the sum of its proper divisors (1).

278552608987 is an equidigital number, since it uses as much as digits as its factorization.

278552608987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135475200, while the sum is 67.

The spelling of 278552608987 in words is "two hundred seventy-eight billion, five hundred fifty-two million, six hundred eight thousand, nine hundred eighty-seven".