278179265393 has 2 divisors, whose sum is σ = 278179265394. Its totient is φ = 278179265392.

The previous prime is 278179265339. The next prime is 278179265423. The reversal of 278179265393 is 393562971872.

Together with previous prime (278179265339) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235756860304 + 42422405089 = 485548^2 + 205967^2 .

It is a cyclic number.

It is not a de Polignac number, because 278179265393 - 2²⁶ = 278112156529 is a prime.

It is not a weakly prime, because it can be changed into another prime (278179265303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139089632696 + 139089632697.

It is an arithmetic number, because the mean of its divisors is an integer number (139089632697).

Almost surely, 2^278179265393 is an apocalyptic number.

It is an amenable number.

278179265393 is a deficient number, since it is larger than the sum of its proper divisors (1).

278179265393 is an equidigital number, since it uses as much as digits as its factorization.

278179265393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 62.

The spelling of 278179265393 in words is "two hundred seventy-eight billion, one hundred seventy-nine million, two hundred sixty-five thousand, three hundred ninety-three".