278323400678399 has 2 divisors, whose sum is σ = 278323400678400. Its totient is φ = 278323400678398.

The previous prime is 278323400678381. The next prime is 278323400678417. The reversal of 278323400678399 is 993876004323872.

It is a balanced prime because it is at equal distance from previous prime (278323400678381) and next prime (278323400678417).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278323400678399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278323400678359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139161700339199 + 139161700339200.

It is an arithmetic number, because the mean of its divisors is an integer number (139161700339200).

Almost surely, 2^{278323400678399} is an apocalyptic number.

278323400678399 is a deficient number, since it is larger than the sum of its proper divisors (1).

278323400678399 is an equidigital number, since it uses as much as digits as its factorization.

278323400678399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658409472, while the sum is 71.

The spelling of 278323400678399 in words is "two hundred seventy-eight trillion, three hundred twenty-three billion, four hundred million, six hundred seventy-eight thousand, three hundred ninety-nine".