278808162643723 has 2 divisors, whose sum is σ = 278808162643724. Its totient is φ = 278808162643722.

The previous prime is 278808162643697. The next prime is 278808162643727. The reversal of 278808162643723 is 327346261808872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278808162643723 is a prime.

It is not a weakly prime, because it can be changed into another prime (278808162643727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139404081321861 + 139404081321862.

It is an arithmetic number, because the mean of its divisors is an integer number (139404081321862).

Almost surely, 2^{278808162643723} is an apocalyptic number.

278808162643723 is a deficient number, since it is larger than the sum of its proper divisors (1).

278808162643723 is an equidigital number, since it uses as much as digits as its factorization.

278808162643723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 260112384, while the sum is 67.

The spelling of 278808162643723 in words is "two hundred seventy-eight trillion, eight hundred eight billion, one hundred sixty-two million, six hundred forty-three thousand, seven hundred twenty-three".