278322432649 has 2 divisors, whose sum is σ = 278322432650. Its totient is φ = 278322432648.

The previous prime is 278322432623. The next prime is 278322432667. The reversal of 278322432649 is 946234223872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205385708025 + 72936724624 = 453195^2 + 270068^2 .

It is a cyclic number.

It is not a de Polignac number, because 278322432649 - 2⁹ = 278322432137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278322432596 and 278322432605.

It is not a weakly prime, because it can be changed into another prime (278322432679) 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, 139161216324 + 139161216325.

It is an arithmetic number, because the mean of its divisors is an integer number (139161216325).

Almost surely, 2^278322432649 is an apocalyptic number.

It is an amenable number.

278322432649 is a deficient number, since it is larger than the sum of its proper divisors (1).

278322432649 is an equidigital number, since it uses as much as digits as its factorization.

278322432649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 52.

The spelling of 278322432649 in words is "two hundred seventy-eight billion, three hundred twenty-two million, four hundred thirty-two thousand, six hundred forty-nine".