278681089747 has 2 divisors, whose sum is σ = 278681089748. Its totient is φ = 278681089746.

The previous prime is 278681089697. The next prime is 278681089787. The reversal of 278681089747 is 747980186872.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278681089747 is a prime.

It is not a weakly prime, because it can be changed into another prime (278681089787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139340544873 + 139340544874.

It is an arithmetic number, because the mean of its divisors is an integer number (139340544874).

Almost surely, 2^278681089747 is an apocalyptic number.

278681089747 is a deficient number, since it is larger than the sum of its proper divisors (1).

278681089747 is an equidigital number, since it uses as much as digits as its factorization.

278681089747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75866112, while the sum is 67.

The spelling of 278681089747 in words is "two hundred seventy-eight billion, six hundred eighty-one million, eighty-nine thousand, seven hundred forty-seven".