278916979793 has 2 divisors, whose sum is σ = 278916979794. Its totient is φ = 278916979792.

The previous prime is 278916979763. The next prime is 278916979823. The reversal of 278916979793 is 397979619872.

It is a balanced prime because it is at equal distance from previous prime (278916979763) and next prime (278916979823).

It can be written as a sum of positive squares in only one way, i.e., 275044655809 + 3872323984 = 524447^2 + 62228^2 .

It is a cyclic number.

It is not a de Polignac number, because 278916979793 - 2²⁴ = 278900202577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (278916979753) 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, 139458489896 + 139458489897.

It is an arithmetic number, because the mean of its divisors is an integer number (139458489897).

Almost surely, 2^278916979793 is an apocalyptic number.

It is an amenable number.

278916979793 is a deficient number, since it is larger than the sum of its proper divisors (1).

278916979793 is an equidigital number, since it uses as much as digits as its factorization.

278916979793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648121824, while the sum is 77.

The spelling of 278916979793 in words is "two hundred seventy-eight billion, nine hundred sixteen million, nine hundred seventy-nine thousand, seven hundred ninety-three".